diff --git a/backEnd/src/main/java/com/quiz/ourclass/domain/challenge/controller/ChallengeController.java b/backEnd/src/main/java/com/quiz/ourclass/domain/challenge/controller/ChallengeController.java
index a247ec6f..5fe1589d 100644
--- a/backEnd/src/main/java/com/quiz/ourclass/domain/challenge/controller/ChallengeController.java
+++ b/backEnd/src/main/java/com/quiz/ourclass/domain/challenge/controller/ChallengeController.java
@@ -33,7 +33,7 @@ public class ChallengeController implements ChallengeControllerDocs {
     private final ChallengeService challengeService;
 
     @GetMapping
-    public ResponseEntity<ResultResponse<?>> getChallenges(
+    public ResponseEntity<ResultResponse<ChallengeSliceResponse>> getChallenges(
         ChallengeSliceRequest challengeSliceRequest) {
         ChallengeSliceResponse challengeSliceResponse = challengeService.getChallenges(
             challengeSliceRequest);
@@ -41,51 +41,53 @@ public ResponseEntity<ResultResponse<?>> getChallenges(
     }
 
     @PostMapping
-    public ResponseEntity<ResultResponse<?>> createChallenge(
+    public ResponseEntity<ResultResponse<Long>> createChallenge(
         @RequestBody ChallengeRequest challengeRequest) {
         return ResponseEntity.ok(
             ResultResponse.success(challengeService.createChallenge(challengeRequest)));
     }
 
     @PostMapping(value = "/reports", consumes = MediaType.MULTIPART_FORM_DATA_VALUE)
-    public ResponseEntity<ResultResponse<?>> createReport(
+    public ResponseEntity<ResultResponse<Long>> createReport(
         @RequestPart ReportRequest reportRequest, @RequestPart MultipartFile file) {
         long reportId = challengeService.createReport(reportRequest, file);
         return ResponseEntity.ok(ResultResponse.success(reportId));
     }
 
     @PatchMapping(value = "/reports/{id}")
-    public ResponseEntity<ResultResponse<?>> confirmReport(@PathVariable long id,
+    public ResponseEntity<ResultResponse<Boolean>> confirmReport(@PathVariable long id,
         ReportType reportType) {
         challengeService.confirmReport(id, reportType);
-        return ResponseEntity.ok(ResultResponse.success(null));
+        return ResponseEntity.ok(ResultResponse.success(true));
     }
 
     @GetMapping("/running")
-    public ResponseEntity<ResultResponse<?>> getRunningChallenge(
-        @RequestParam(required = true) long organizationId) {
+    public ResponseEntity<ResultResponse<RunningChallengeResponse>> getRunningChallenge(
+        @RequestParam long organizationId) {
         RunningChallengeResponse runningChallengeResponse = challengeService.getRunningChallenge(
             organizationId);
         return ResponseEntity.ok(ResultResponse.success(runningChallengeResponse));
     }
 
     @GetMapping("/running/member")
-    public ResponseEntity<ResultResponse<?>> getRunningMemberChallenge(
-        @RequestParam(required = true) long organizationId) {
+    public ResponseEntity<ResultResponse<RunningMemberChallengeResponse>> getRunningMemberChallenge(
+        @RequestParam long organizationId) {
         RunningMemberChallengeResponse runningMemberChallenge = challengeService.getRunningMemberChallenge(
             organizationId);
         return ResponseEntity.ok(ResultResponse.success(runningMemberChallenge));
     }
 
     @GetMapping("/{id}")
-    public ResponseEntity<ResultResponse<?>> getChallengeDetail(@PathVariable long id,
+    public ResponseEntity<ResultResponse<ChallengeResponse>> getChallengeDetail(
+        @PathVariable long id,
         @RequestParam(required = false) Long groupId) {
         ChallengeResponse challengeResponse = challengeService.getChallengeDetail(id, groupId);
         return ResponseEntity.ok(ResultResponse.success(challengeResponse));
     }
 
     @GetMapping("/{id}/simple")
-    public ResponseEntity<ResultResponse<?>> getChallengeSimple(@PathVariable long id) {
+    public ResponseEntity<ResultResponse<ChallengeSimpleResponse>> getChallengeSimple(
+        @PathVariable long id) {
         ChallengeSimpleResponse challengeSimple = challengeService.getChallengeSimple(id);
         return ResponseEntity.ok(ResultResponse.success(challengeSimple));
     }
diff --git a/backEnd/src/main/java/com/quiz/ourclass/domain/challenge/controller/ChallengeControllerDocs.java b/backEnd/src/main/java/com/quiz/ourclass/domain/challenge/controller/ChallengeControllerDocs.java
index 22589b1b..77e398b2 100644
--- a/backEnd/src/main/java/com/quiz/ourclass/domain/challenge/controller/ChallengeControllerDocs.java
+++ b/backEnd/src/main/java/com/quiz/ourclass/domain/challenge/controller/ChallengeControllerDocs.java
@@ -38,7 +38,7 @@ public interface ChallengeControllerDocs {
                 content = @Content(schema = @Schema(implementation = ChallengeSliceResponse.class)))
         })
     @GetMapping
-    ResponseEntity<ResultResponse<?>> getChallenges(
+    ResponseEntity<ResultResponse<ChallengeSliceResponse>> getChallenges(
         ChallengeSliceRequest challengeSliceRequest
     );
 
@@ -51,7 +51,7 @@ ResponseEntity<ResultResponse<?>> getChallenges(
             @ApiResponse(responseCode = "404", description = "(message : \"학급을 찾을 수 없습니다.\")", content = @Content)
         })
     @PostMapping
-    public ResponseEntity<ResultResponse<?>> createChallenge(
+    ResponseEntity<ResultResponse<Long>> createChallenge(
         @RequestBody
         ChallengeRequest challengeRequest
     );
@@ -65,7 +65,7 @@ public ResponseEntity<ResultResponse<?>> createChallenge(
             @ApiResponse(responseCode = "500", description = "(message : \"AWS 서버 에러입니다.\")", content = @Content)
         })
     @PostMapping(value = "/reports", consumes = MediaType.MULTIPART_FORM_DATA_VALUE)
-    ResponseEntity<ResultResponse<?>> createReport(
+    ResponseEntity<ResultResponse<Long>> createReport(
         @RequestPart
         ReportRequest reportRequest,
         @RequestPart
@@ -79,7 +79,7 @@ ResponseEntity<ResultResponse<?>> createReport(
             @ApiResponse(responseCode = "404", description = "(message : \"레포트를 찾을 수 없습니다.\")", content = @Content)
         })
     @PatchMapping(value = "/reports/{id}")
-    public ResponseEntity<ResultResponse<?>> confirmReport(
+    ResponseEntity<ResultResponse<Boolean>> confirmReport(
         @Schema(description = "레포트 id")
         @PathVariable
         long id,
@@ -102,8 +102,8 @@ public ResponseEntity<ResultResponse<?>> confirmReport(
                 """, content = @Content)
         })
     @GetMapping("/running")
-    public ResponseEntity<ResultResponse<?>> getRunningChallenge(
-        @RequestParam(required = true)
+    ResponseEntity<ResultResponse<RunningChallengeResponse>> getRunningChallenge(
+        @RequestParam
         @Parameter(description = "학급 ID", required = true, in = ParameterIn.QUERY)
         long organizationId
     );
@@ -125,8 +125,8 @@ public ResponseEntity<ResultResponse<?>> getRunningChallenge(
                 """, content = @Content)
         })
     @GetMapping("/running/member")
-    ResponseEntity<ResultResponse<?>> getRunningMemberChallenge(
-        @RequestParam(required = true)
+    ResponseEntity<ResultResponse<RunningMemberChallengeResponse>> getRunningMemberChallenge(
+        @RequestParam
         @Parameter(description = "학급 ID", required = true, in = ParameterIn.QUERY)
         long organizationId
     );
@@ -139,12 +139,12 @@ ResponseEntity<ResultResponse<?>> getRunningMemberChallenge(
                 content = @Content(schema = @Schema(implementation = ChallengeResponse.class)))
         })
     @GetMapping("/{id}")
-    public ResponseEntity<ResultResponse<?>> getChallengeDetail(
+    ResponseEntity<ResultResponse<ChallengeResponse>> getChallengeDetail(
         @PathVariable
         @Parameter(description = "함께달리기 ID", required = true, in = ParameterIn.PATH)
         long id,
         @RequestParam(required = false)
-        @Parameter(description = "그룹 ID", required = false, in = ParameterIn.QUERY)
+        @Parameter(description = "그룹 ID", in = ParameterIn.QUERY)
         Long groupId);
 
     @Operation(summary = "함께달리기 요약 조회",
@@ -153,7 +153,7 @@ public ResponseEntity<ResultResponse<?>> getChallengeDetail(
                 content = @Content(schema = @Schema(implementation = ChallengeSimpleResponse.class)))
         })
     @GetMapping("/{id}/simple")
-    ResponseEntity<ResultResponse<?>> getChallengeSimple(
+    ResponseEntity<ResultResponse<ChallengeSimpleResponse>> getChallengeSimple(
         @PathVariable
         @Parameter(description = "함께달리기 ID", required = true, in = ParameterIn.PATH)
         long id
diff --git a/backEnd/src/main/java/com/quiz/ourclass/domain/challenge/controller/GroupController.java b/backEnd/src/main/java/com/quiz/ourclass/domain/challenge/controller/GroupController.java
index b51a0910..b4611321 100644
--- a/backEnd/src/main/java/com/quiz/ourclass/domain/challenge/controller/GroupController.java
+++ b/backEnd/src/main/java/com/quiz/ourclass/domain/challenge/controller/GroupController.java
@@ -2,6 +2,7 @@
 
 import com.quiz.ourclass.domain.challenge.dto.request.AutoGroupMatchingRequest;
 import com.quiz.ourclass.domain.challenge.dto.response.AutoGroupMatchingResponse;
+import com.quiz.ourclass.domain.challenge.dto.response.MatchingRoomResponse;
 import com.quiz.ourclass.domain.challenge.service.GroupService;
 import com.quiz.ourclass.global.dto.ResultResponse;
 import java.util.List;
@@ -21,37 +22,39 @@ public class GroupController implements GroupControllerDocs {
     private final GroupService groupService;
 
     @PostMapping("/groups/matchingroom")
-    public ResponseEntity<ResultResponse<?>> createMatchingRoom(long challengeId) {
+    public ResponseEntity<ResultResponse<MatchingRoomResponse>> createMatchingRoom(
+        long challengeId) {
         return ResponseEntity.ok(
             ResultResponse.success(groupService.createMatchingRoom(challengeId)));
     }
 
     @PostMapping("/groups/join")
-    public ResponseEntity<ResultResponse<?>> joinMatchingRoom(String key, boolean joinStatus) {
+    public ResponseEntity<ResultResponse<Boolean>> joinMatchingRoom(String key,
+        boolean joinStatus) {
         return ResponseEntity.ok(
             ResultResponse.success(groupService.joinMatchingRoom(key, joinStatus)));
     }
 
     @PostMapping("/groups")
-    public ResponseEntity<ResultResponse<?>> createGroup(String key) {
+    public ResponseEntity<ResultResponse<Long>> createGroup(String key) {
         return ResponseEntity.ok(
             ResultResponse.success(groupService.createGroup(key)));
     }
 
     @DeleteMapping("/groups/matching")
-    public ResponseEntity<ResultResponse<?>> deleteMatchingMember(String key, Long memberId) {
+    public ResponseEntity<ResultResponse<Boolean>> deleteMatchingMember(String key, Long memberId) {
         groupService.deleteMatchingMember(key, memberId);
-        return ResponseEntity.ok(ResultResponse.success(null));
+        return ResponseEntity.ok(ResultResponse.success(true));
     }
 
     @GetMapping("/groups/invite")
-    public ResponseEntity<ResultResponse<?>> inviteMatchingRoom(String key, Long memberId) {
+    public ResponseEntity<ResultResponse<Boolean>> inviteMatchingRoom(String key, Long memberId) {
         groupService.inviteMatchingRoom(key, memberId);
-        return ResponseEntity.ok(ResultResponse.success(null));
+        return ResponseEntity.ok(ResultResponse.success(true));
     }
 
     @GetMapping("/groups/matching")
-    public ResponseEntity<ResultResponse<?>> getGroupMatching(
+    public ResponseEntity<ResultResponse<List<AutoGroupMatchingResponse>>> getGroupMatching(
         AutoGroupMatchingRequest autoGroupMatchingRequest) {
         List<AutoGroupMatchingResponse> autoGroupMatchingResponse =
 //            groupService.getGroupMatching(autoGroupMatchingRequest);
diff --git a/backEnd/src/main/java/com/quiz/ourclass/domain/challenge/controller/GroupControllerDocs.java b/backEnd/src/main/java/com/quiz/ourclass/domain/challenge/controller/GroupControllerDocs.java
index 26b601cd..34574b66 100644
--- a/backEnd/src/main/java/com/quiz/ourclass/domain/challenge/controller/GroupControllerDocs.java
+++ b/backEnd/src/main/java/com/quiz/ourclass/domain/challenge/controller/GroupControllerDocs.java
@@ -11,6 +11,7 @@
 import io.swagger.v3.oas.annotations.media.Schema;
 import io.swagger.v3.oas.annotations.responses.ApiResponse;
 import io.swagger.v3.oas.annotations.tags.Tag;
+import java.util.List;
 import org.springframework.http.ResponseEntity;
 import org.springframework.web.bind.annotation.DeleteMapping;
 import org.springframework.web.bind.annotation.GetMapping;
@@ -27,7 +28,7 @@ public interface GroupControllerDocs {
                 content = @Content(schema = @Schema(implementation = MatchingRoomResponse.class)))
         })
     @PostMapping("/groups/matchingroom")
-    ResponseEntity<ResultResponse<?>> createMatchingRoom(
+    ResponseEntity<ResultResponse<MatchingRoomResponse>> createMatchingRoom(
         @Parameter(description = "함께달리기 ID", required = true, in = ParameterIn.QUERY)
         long challengeId
     );
@@ -44,7 +45,7 @@ ResponseEntity<ResultResponse<?>> createMatchingRoom(
                 content = @Content(schema = @Schema(implementation = Boolean.class, description = "초대 응답")))
         })
     @PostMapping("/groups/join")
-    ResponseEntity<ResultResponse<?>> joinMatchingRoom(
+    ResponseEntity<ResultResponse<Boolean>> joinMatchingRoom(
         @Parameter(description = "그룹 대기방 KEY", required = true, in = ParameterIn.QUERY)
         String key,
         @Parameter(description = "초대 수락 여부", required = true, in = ParameterIn.QUERY)
@@ -61,7 +62,7 @@ ResponseEntity<ResultResponse<?>> joinMatchingRoom(
 
         })
     @PostMapping("/groups")
-    ResponseEntity<ResultResponse<?>> createGroup(
+    ResponseEntity<ResultResponse<Long>> createGroup(
         @Parameter(description = "그룹 대기방 KEY", required = true, in = ParameterIn.QUERY)
         String key
     );
@@ -73,7 +74,7 @@ ResponseEntity<ResultResponse<?>> createGroup(
             @ApiResponse(responseCode = "200", description = "(message : \"Success\")")
         })
     @DeleteMapping("/groups/matching")
-    ResponseEntity<ResultResponse<?>> deleteMatchingMember(
+    ResponseEntity<ResultResponse<Boolean>> deleteMatchingMember(
         @Parameter(description = "그룹 대기방 KEY", required = true, in = ParameterIn.QUERY)
         String key,
         @Parameter(description = "추방 멤버 ID", required = true, in = ParameterIn.QUERY)
@@ -87,7 +88,7 @@ ResponseEntity<ResultResponse<?>> deleteMatchingMember(
             @ApiResponse(responseCode = "200", description = "(message : \"Success\")")
         })
     @GetMapping("/groups/invite")
-    ResponseEntity<ResultResponse<?>> inviteMatchingRoom(
+    ResponseEntity<ResultResponse<Boolean>> inviteMatchingRoom(
         @Parameter(description = "그룹 대기방 KEY", required = true, in = ParameterIn.QUERY)
         String key,
         @Parameter(description = "초대 멤버 ID", required = true, in = ParameterIn.QUERY)
@@ -101,7 +102,7 @@ ResponseEntity<ResultResponse<?>> inviteMatchingRoom(
                 content = @Content(schema = @Schema(implementation = AutoGroupMatchingResponse.class)))
         })
     @GetMapping("/groups/matching")
-    ResponseEntity<ResultResponse<?>> getGroupMatching(
+    ResponseEntity<ResultResponse<List<AutoGroupMatchingResponse>>> getGroupMatching(
         AutoGroupMatchingRequest autoGroupMatchingRequest
     );
 }
diff --git a/backEnd/src/main/java/com/quiz/ourclass/domain/challenge/mapper/ChallengeMapper.java b/backEnd/src/main/java/com/quiz/ourclass/domain/challenge/mapper/ChallengeMapper.java
index 336193cd..f316d90a 100644
--- a/backEnd/src/main/java/com/quiz/ourclass/domain/challenge/mapper/ChallengeMapper.java
+++ b/backEnd/src/main/java/com/quiz/ourclass/domain/challenge/mapper/ChallengeMapper.java
@@ -25,7 +25,6 @@ public interface ChallengeMapper {
     @Mapping(target = "createTime", source = "challengeGroup.createTime")
     @Mapping(target = "endStatus", source = "challengeGroup.completeStatus")
     @Mapping(target = "memberNames", source = "challengeGroup.groupMembers")
-//, qualifiedByName = "MemberToString")
     RunningMemberChallengeResponse groupToRunningMember(ChallengeSimpleDTO challengeSimpleDTO,
         ChallengeGroup challengeGroup, boolean leaderStatus);
 
@@ -33,13 +32,4 @@ RunningMemberChallengeResponse groupToRunningMember(ChallengeSimpleDTO challenge
     @Mapping(target = "name", source = "member.name")
     @Mapping(target = "photo", source = "member.profileImage")
     MemberSimpleDTO groupMemberToMemberSimpleDTO(GroupMember groupMember);
-
-//    @Named("MemberToString")
-//    static List<String> memberToString(List<GroupMember> groupMembers) {
-//        return groupMembers.stream()
-//            .map(groupMember -> {
-//                MemberSimpleDTO
-//            })
-//            .collect(Collectors.toList());
-//    }
 }
diff --git a/backEnd/src/main/java/com/quiz/ourclass/domain/challenge/repository/ChallengeRepositoryQuerydslImpl.java b/backEnd/src/main/java/com/quiz/ourclass/domain/challenge/repository/ChallengeRepositoryQuerydslImpl.java
index fc371505..1654b5de 100644
--- a/backEnd/src/main/java/com/quiz/ourclass/domain/challenge/repository/ChallengeRepositoryQuerydslImpl.java
+++ b/backEnd/src/main/java/com/quiz/ourclass/domain/challenge/repository/ChallengeRepositoryQuerydslImpl.java
@@ -51,7 +51,7 @@ public ChallengeSliceResponse getChallenges(ChallengeSliceRequest request) {
             .from(challenge)
             .where(challengeCondition)
             .offset(pageable.getOffset())
-            .limit(pageable.getPageSize() + 1)
+            .limit(pageable.getPageSize() + 1L)
             .orderBy(challenge.id.desc())
             .fetch();
 
diff --git a/backEnd/src/main/java/com/quiz/ourclass/domain/challenge/service/ChallengeServiceImpl.java b/backEnd/src/main/java/com/quiz/ourclass/domain/challenge/service/ChallengeServiceImpl.java
index 1b79f13f..70d9a308 100644
--- a/backEnd/src/main/java/com/quiz/ourclass/domain/challenge/service/ChallengeServiceImpl.java
+++ b/backEnd/src/main/java/com/quiz/ourclass/domain/challenge/service/ChallengeServiceImpl.java
@@ -233,7 +233,7 @@ protected void challengeClosing(Challenge challenge) {
 
     @EventListener(ApplicationReadyEvent.class)
     @Transactional
-    protected void challengeClosingReload() {
+    public void challengeClosingReload() {
         List<Challenge> challenges = challengeRepository.findAllByEndStatusIsFalse();
         challenges.forEach(challenge -> {
             log.info(challenge.getEndTime().toString());
diff --git a/backEnd/src/main/java/com/quiz/ourclass/domain/challenge/service/GroupServiceImpl.java b/backEnd/src/main/java/com/quiz/ourclass/domain/challenge/service/GroupServiceImpl.java
index 8e6b5ea3..526f7d71 100644
--- a/backEnd/src/main/java/com/quiz/ourclass/domain/challenge/service/GroupServiceImpl.java
+++ b/backEnd/src/main/java/com/quiz/ourclass/domain/challenge/service/GroupServiceImpl.java
@@ -21,11 +21,11 @@
 import com.quiz.ourclass.domain.notice.service.SseService;
 import com.quiz.ourclass.domain.organization.entity.Relationship;
 import com.quiz.ourclass.domain.organization.repository.MemberOrganizationRepository;
-import com.quiz.ourclass.domain.organization.repository.OrganizationRepository;
 import com.quiz.ourclass.domain.organization.repository.RelationshipRepository;
 import com.quiz.ourclass.global.dto.MemberSimpleDTO;
 import com.quiz.ourclass.global.exception.ErrorCode;
 import com.quiz.ourclass.global.exception.GlobalException;
+import com.quiz.ourclass.global.util.ConstantUtil;
 import com.quiz.ourclass.global.util.RedisUtil;
 import com.quiz.ourclass.global.util.UserAccessUtil;
 import java.time.LocalDateTime;
@@ -50,25 +50,23 @@ public class GroupServiceImpl implements GroupService {
     private final MemberRepository memberRepository;
     private final ChallengeRepository challengeRepository;
     private final RelationshipRepository relationshipRepository;
-    private final OrganizationRepository organizationRepository;
     private final MemberOrganizationRepository memberOrganizationRepository;
     private final UserAccessUtil accessUtil;
     private final RedisUtil redisUtil;
     private final MemberMapper memberMapper;
     private final FriendlyGroup friendlyGroup;
-    private final static String REDIS_GROUP_KEY = "CHALLENGE_LEADER:";
 
     @Transactional
     @Override
     public MatchingRoomResponse createMatchingRoom(long challengeId) {
-        long MemberId = accessUtil.getMember()
+        long memberId = accessUtil.getMember()
             .orElseThrow(() -> new GlobalException(ErrorCode.MEMBER_NOT_FOUND)).getId();
-        String dataKey = makeGroupKey(challengeId, MemberId);
+        String dataKey = makeGroupKey(challengeId, memberId);
         Set<String> redisMembers = redisUtil.setMembers(dataKey);
         if (redisMembers != null && !redisMembers.isEmpty()) {
             redisUtil.delete(dataKey);
         }
-        redisUtil.setAdd(dataKey, String.valueOf(MemberId));
+        redisUtil.setAdd(dataKey, String.valueOf(memberId));
         Challenge challenge = challengeRepository.findById(challengeId)
             .orElseThrow(() -> new GlobalException(CHALLENGE_NOT_FOUND));
         int minCount = challenge.getMinCount();
@@ -209,7 +207,7 @@ public List<AutoGroupMatchingResponse> getGroupMatching(
                 return getUnfriendlyGroup(autoGroupMatchingRequest);
             }
         }
-        return null;
+        return new ArrayList<>();
     }
 
     // TODO : 테스트 끝나고 해당 코드 지우기
@@ -248,7 +246,7 @@ public List<AutoGroupMatchingResponse> testMethod(
             .filter(Optional::isPresent)
             .map(Optional::get)
             .map(memberMapper::memberToMemberSimpleDTO)
-            .collect(Collectors.toList());
+            .toList();
         groups.add(testGroup);
         return groups.stream().map(group -> AutoGroupMatchingResponse.builder()
                 .members(group)
@@ -312,8 +310,8 @@ private List<AutoGroupMatchingResponse> getUnfriendlyGroup(
         return null;
     }
 
-    private static String makeGroupKey(long challengeId, long MemberId) {
-        return REDIS_GROUP_KEY + challengeId + "_" + MemberId;
+    private static String makeGroupKey(long challengeId, long memberId) {
+        return ConstantUtil.REDIS_GROUP_KEY + challengeId + "_" + memberId;
     }
 
     private static long getChallengeIdFromKey(String key) {
diff --git a/backEnd/src/main/java/com/quiz/ourclass/domain/notice/service/SseService.java b/backEnd/src/main/java/com/quiz/ourclass/domain/notice/service/SseService.java
index 9648a812..4b08b991 100644
--- a/backEnd/src/main/java/com/quiz/ourclass/domain/notice/service/SseService.java
+++ b/backEnd/src/main/java/com/quiz/ourclass/domain/notice/service/SseService.java
@@ -7,5 +7,5 @@ public interface SseService {
 
     SseEmitter subscribe(String lastEventId);
 
-    void send(SseDTO SseDto);
+    void send(SseDTO sseDto);
 }
diff --git a/backEnd/src/main/java/com/quiz/ourclass/domain/notice/service/SseServiceImpl.java b/backEnd/src/main/java/com/quiz/ourclass/domain/notice/service/SseServiceImpl.java
index e928dc84..c7c58bc4 100644
--- a/backEnd/src/main/java/com/quiz/ourclass/domain/notice/service/SseServiceImpl.java
+++ b/backEnd/src/main/java/com/quiz/ourclass/domain/notice/service/SseServiceImpl.java
@@ -5,6 +5,7 @@
 import com.quiz.ourclass.domain.notice.repository.SseRepository;
 import com.quiz.ourclass.global.exception.ErrorCode;
 import com.quiz.ourclass.global.exception.GlobalException;
+import com.quiz.ourclass.global.util.ConstantUtil;
 import com.quiz.ourclass.global.util.UserAccessUtil;
 import java.io.IOException;
 import java.time.LocalDateTime;
@@ -19,8 +20,6 @@
 @Service
 public class SseServiceImpl implements SseService {
 
-    private static final Long DEFAULT_TIMEOUT = 60L * 1000 * 20;
-    private static final Long REDIRECT_TIME = 5L * 1000;
     private final SseRepository sseRepository;
     private final UserAccessUtil accessUtil;
 
@@ -29,7 +28,8 @@ public SseEmitter subscribe(String lastEventId) {
         long loginUserId = accessUtil.getMember()
             .orElseThrow(() -> new GlobalException(ErrorCode.MEMBER_NOT_FOUND)).getId();
         String emitterId = makeTimeIncludeId(String.valueOf(loginUserId));
-        SseEmitter emitter = sseRepository.save(emitterId, new SseEmitter(DEFAULT_TIMEOUT));
+        SseEmitter emitter = sseRepository.save(emitterId,
+            new SseEmitter(ConstantUtil.DEFAULT_TIMEOUT));
 
         // emitter의 상태를 체크함, 완료되었는지 타임아웃이 났는지
         checkEmitterStatus(emitter, emitterId);
@@ -47,7 +47,6 @@ public SseEmitter subscribe(String lastEventId) {
         if (lastEventId != null && !lastEventId.isEmpty()) {
             sendLostData(lastEventId, String.valueOf(loginUserId), emitterId, emitter);
         }
-        log.info("SSE연결 요청 : 유저 " + loginUserId + ", 에미터 " + emitterId);
         return emitter;
     }
 
@@ -75,7 +74,7 @@ private void sendSse(SseEmitter emitter, String eventId, String emitterId, SseDT
         try {
             emitter.send(SseEmitter.event()
                 .id(eventId)
-                .reconnectTime(REDIRECT_TIME)
+                .reconnectTime(ConstantUtil.REDIRECT_TIME)
                 .name(dto.eventType().toString())
                 .data(dto));
         } catch (IOException exception) {
@@ -90,18 +89,9 @@ private String makeTimeIncludeId(String userId) {
 
     //종료 상태
     private void checkEmitterStatus(SseEmitter emitter, String emitterId) {
-        emitter.onCompletion(() -> {
-            log.info("SSE연결 해제 : 에미터 " + emitter.toString() + ", 에미터 " + emitterId);
-            sseRepository.deleteById(emitterId);
-        });
-        emitter.onTimeout(() -> {
-            log.info("SSE연결 타임아웃 : 에미터 " + emitter.toString() + ", 에미터 " + emitterId);
-            sseRepository.deleteById(emitterId);
-        });
-        emitter.onError((e) -> {
-            log.info("SSE연결 에러 : 에미터 " + emitter.toString() + ", 에미터 " + emitterId);
-            sseRepository.deleteById(emitterId);
-        });
+        emitter.onCompletion(() -> sseRepository.deleteById(emitterId));
+        emitter.onTimeout(() -> sseRepository.deleteById(emitterId));
+        emitter.onError(e -> sseRepository.deleteById(emitterId));
     }
 
     private void sendLostData(String lastEventId, String userId, String emitterId,
diff --git a/backEnd/src/main/java/com/quiz/ourclass/domain/organization/controller/MemberOrgController.java b/backEnd/src/main/java/com/quiz/ourclass/domain/organization/controller/MemberOrgController.java
index 6b8fe489..0b637dac 100644
--- a/backEnd/src/main/java/com/quiz/ourclass/domain/organization/controller/MemberOrgController.java
+++ b/backEnd/src/main/java/com/quiz/ourclass/domain/organization/controller/MemberOrgController.java
@@ -32,7 +32,7 @@ public class MemberOrgController implements MemberOrgControllerDocs {
     private final MemberOrgService memberOrgService;
 
     @PatchMapping("/{id}/point")
-    public ResponseEntity<ResultResponse<?>> updateMemberExp(@PathVariable long id,
+    public ResponseEntity<ResultResponse<UpdateExpResponse>> updateMemberExp(@PathVariable long id,
         @RequestBody UpdateExpRequest updateExpRequest) {
         UpdateExpResponse updateExpResponse = memberOrgService.updateMemberExp(
             id, updateExpRequest);
@@ -40,7 +40,7 @@ public ResponseEntity<ResultResponse<?>> updateMemberExp(@PathVariable long id,
     }
 
     @GetMapping("/{id}/relation")
-    public ResponseEntity<ResultResponse<?>> getMemberRelation(
+    public ResponseEntity<ResultResponse<RelationResponse>> getMemberRelation(
         @PathVariable long id, RelationRequest relationRequest) {
         RelationResponse relationResponse = memberOrgService.getMemberRelation(
             id, relationRequest);
@@ -48,14 +48,14 @@ public ResponseEntity<ResultResponse<?>> getMemberRelation(
     }
 
     @GetMapping("/{id}")
-    public ResponseEntity<ResultResponse<?>> getMemberDetail(
+    public ResponseEntity<ResultResponse<MemberDetailResponse>> getMemberDetail(
         @PathVariable long id, long memberId) {
         MemberDetailResponse memberDetail = memberOrgService.getMemberDetail(id, memberId);
         return ResponseEntity.ok(ResultResponse.success(memberDetail));
     }
 
     @GetMapping("/{id}/relations")
-    public ResponseEntity<ResultResponse<?>> getMemberRelations(
+    public ResponseEntity<ResultResponse<List<RelationSimpleResponse>>> getMemberRelations(
         @PathVariable long id, long memberId, @RequestParam(required = false) Long limit) {
         List<RelationSimpleResponse> relations = memberOrgService.getMemberRelations(
             id, memberId, limit);
@@ -63,13 +63,14 @@ public ResponseEntity<ResultResponse<?>> getMemberRelations(
     }
 
     @GetMapping("/{id}/home")
-    public ResponseEntity<ResultResponse<?>> getOrganizationHome(@PathVariable long id) {
+    public ResponseEntity<ResultResponse<OrganizationHomeResponse>> getOrganizationHome(
+        @PathVariable long id) {
         OrganizationHomeResponse homeResponse = memberOrgService.getOrganizationHome(id);
         return ResponseEntity.ok(ResultResponse.success(homeResponse));
     }
 
     @PostMapping("/tag")
-    public ResponseEntity<ResultResponse<?>> tagGreet(
+    public ResponseEntity<ResultResponse<Integer>> tagGreet(
         @RequestBody TagGreetingRequest tagGreetingRequest) {
         int tagGreetingCount = memberOrgService.tagGreeting(tagGreetingRequest);
         return ResponseEntity.ok(ResultResponse.success(tagGreetingCount));
diff --git a/backEnd/src/main/java/com/quiz/ourclass/domain/organization/controller/MemberOrgControllerDocs.java b/backEnd/src/main/java/com/quiz/ourclass/domain/organization/controller/MemberOrgControllerDocs.java
index 4459d9f2..6f053f03 100644
--- a/backEnd/src/main/java/com/quiz/ourclass/domain/organization/controller/MemberOrgControllerDocs.java
+++ b/backEnd/src/main/java/com/quiz/ourclass/domain/organization/controller/MemberOrgControllerDocs.java
@@ -16,6 +16,7 @@
 import io.swagger.v3.oas.annotations.media.Schema;
 import io.swagger.v3.oas.annotations.responses.ApiResponse;
 import io.swagger.v3.oas.annotations.tags.Tag;
+import java.util.List;
 import org.springframework.http.ResponseEntity;
 import org.springframework.web.bind.annotation.GetMapping;
 import org.springframework.web.bind.annotation.PatchMapping;
@@ -35,7 +36,7 @@ public interface MemberOrgControllerDocs {
             @ApiResponse(responseCode = "404", description = "(message : \"학급 멤버를 찾을 수 없습니다.\")", content = @Content)
         })
     @PatchMapping("/{id}/point")
-    ResponseEntity<ResultResponse<?>> updateMemberExp(
+    ResponseEntity<ResultResponse<UpdateExpResponse>> updateMemberExp(
         @PathVariable
         @Parameter(description = "학급 ID", required = true, in = ParameterIn.PATH)
         long id,
@@ -50,7 +51,7 @@ ResponseEntity<ResultResponse<?>> updateMemberExp(
             @ApiResponse(responseCode = "404", description = "(message : \"두 멤버간의 관계를 찾을 수 없습니다.\")", content = @Content)
         })
     @GetMapping("/{id}/relation")
-    ResponseEntity<ResultResponse<?>> getMemberRelation(
+    ResponseEntity<ResultResponse<RelationResponse>> getMemberRelation(
         @PathVariable
         @Parameter(description = "학급 ID", required = true, in = ParameterIn.PATH)
         long id,
@@ -64,7 +65,7 @@ ResponseEntity<ResultResponse<?>> getMemberRelation(
             @ApiResponse(responseCode = "404", description = "(message : \"학급 멤버를 찾을 수 없습니다.\")", content = @Content)
         })
     @GetMapping("/{id}")
-    ResponseEntity<ResultResponse<?>> getMemberDetail(
+    ResponseEntity<ResultResponse<MemberDetailResponse>> getMemberDetail(
         @PathVariable
         @Parameter(description = "학급 ID", required = true, in = ParameterIn.PATH)
         long id,
@@ -79,14 +80,14 @@ ResponseEntity<ResultResponse<?>> getMemberDetail(
                 content = @Content(schema = @Schema(implementation = RelationSimpleResponse.class)))
         })
     @GetMapping("/{id}/relations")
-    ResponseEntity<ResultResponse<?>> getMemberRelations(
+    ResponseEntity<ResultResponse<List<RelationSimpleResponse>>> getMemberRelations(
         @PathVariable
         @Parameter(description = "학급 ID", required = true, in = ParameterIn.PATH)
         long id,
         @Parameter(description = "멤버 ID", required = true, in = ParameterIn.QUERY)
         long memberId,
         @RequestParam(required = false)
-        @Parameter(description = "상위 n개만 조회 시 추가", required = false, in = ParameterIn.QUERY)
+        @Parameter(description = "상위 n개만 조회 시 추가", in = ParameterIn.QUERY)
         Long limit
     );
 
@@ -97,7 +98,7 @@ ResponseEntity<ResultResponse<?>> getMemberRelations(
                 content = @Content(schema = @Schema(implementation = OrganizationHomeResponse.class)))
         })
     @GetMapping("/{id}/home")
-    ResponseEntity<ResultResponse<?>> getOrganizationHome(
+    ResponseEntity<ResultResponse<OrganizationHomeResponse>> getOrganizationHome(
         @PathVariable
         @Parameter(description = "학급 ID", required = true, in = ParameterIn.PATH)
         long id
@@ -110,7 +111,7 @@ ResponseEntity<ResultResponse<?>> getOrganizationHome(
             @ApiResponse(responseCode = "404", description = "(message : \"두 멤버간의 관계를 찾을 수 없습니다.\")", content = @Content)
         })
     @PostMapping("/tag")
-    ResponseEntity<ResultResponse<?>> tagGreet(
+    ResponseEntity<ResultResponse<Integer>> tagGreet(
         @RequestBody
         TagGreetingRequest tagGreetingRequest
     );
diff --git a/backEnd/src/main/java/com/quiz/ourclass/domain/organization/controller/OrganizationController.java b/backEnd/src/main/java/com/quiz/ourclass/domain/organization/controller/OrganizationController.java
index fa55796a..0286901f 100644
--- a/backEnd/src/main/java/com/quiz/ourclass/domain/organization/controller/OrganizationController.java
+++ b/backEnd/src/main/java/com/quiz/ourclass/domain/organization/controller/OrganizationController.java
@@ -29,39 +29,42 @@ public class OrganizationController implements OrganizationControllerDocs {
     private final OrganizationService organizationService;
 
     @PostMapping
-    public ResponseEntity<ResultResponse<?>> createOrganization(
+    public ResponseEntity<ResultResponse<Long>> createOrganization(
         @RequestBody OrganizationRequest organizationRequest) {
         Long organizationId = organizationService.createOrganization(organizationRequest);
         return ResponseEntity.ok(ResultResponse.success(organizationId));
     }
 
     @GetMapping
-    public ResponseEntity<ResultResponse<?>> getOrganizations() {
+    public ResponseEntity<ResultResponse<List<OrganizationResponse>>> getOrganizations() {
         List<OrganizationResponse> organizations = organizationService.getOrganizations();
         return ResponseEntity.ok(ResultResponse.success(organizations));
     }
 
     @GetMapping("/{id}/code")
-    public ResponseEntity<ResultResponse<?>> getOrganizationCode(@PathVariable long id) {
+    public ResponseEntity<ResultResponse<InviteCodeDTO>> getOrganizationCode(
+        @PathVariable long id) {
         InviteCodeDTO code = organizationService.getOrganizationCode(id);
         return ResponseEntity.ok(ResultResponse.success(code));
     }
 
     @PostMapping("/{id}/join")
-    public ResponseEntity<ResultResponse<?>> joinOrganization(@PathVariable long id,
+    public ResponseEntity<ResultResponse<Long>> joinOrganization(@PathVariable long id,
         @RequestBody InviteCodeDTO inviteCodeDTO) {
         Long organizationId = organizationService.joinOrganization(id, inviteCodeDTO);
         return ResponseEntity.ok(ResultResponse.success(organizationId));
     }
 
     @GetMapping("/{id}/members")
-    public ResponseEntity<ResultResponse<?>> getOrganizationMembers(@PathVariable long id) {
+    public ResponseEntity<ResultResponse<List<MemberSimpleDTO>>> getOrganizationMembers(
+        @PathVariable long id) {
         List<MemberSimpleDTO> members = organizationService.getOrganizationMembers(id);
         return ResponseEntity.ok(ResultResponse.success(members));
     }
 
     @PatchMapping("/{id}")
-    public ResponseEntity<ResultResponse<?>> updateOrganizationName(@PathVariable long id,
+    public ResponseEntity<ResultResponse<UpdateOrganizationResponse>> updateOrganizationName(
+        @PathVariable long id,
         @RequestBody UpdateOrganizationRequest updateOrganizationRequest) {
         UpdateOrganizationResponse updateOrganizationResponse = organizationService.updateOrganizationName(
             id, updateOrganizationRequest);
@@ -69,13 +72,14 @@ public ResponseEntity<ResultResponse<?>> updateOrganizationName(@PathVariable lo
     }
 
     @GetMapping("/{id}/rank")
-    public ResponseEntity<ResultResponse<?>> getRanking(@PathVariable long id) {
+    public ResponseEntity<ResultResponse<List<MemberRankPoint>>> getRanking(@PathVariable long id) {
         List<MemberRankPoint> memberRankPoints = organizationService.getRanking(id);
         return ResponseEntity.ok(ResultResponse.success(memberRankPoints));
     }
 
     @GetMapping("/{id}/summary")
-    public ResponseEntity<ResultResponse<?>> getSummary(@PathVariable long id) {
+    public ResponseEntity<ResultResponse<OrganizationSummaryResponse>> getSummary(
+        @PathVariable long id) {
         OrganizationSummaryResponse summaryResponse = organizationService.getSummary(id);
         return ResponseEntity.ok(ResultResponse.success(summaryResponse));
     }
diff --git a/backEnd/src/main/java/com/quiz/ourclass/domain/organization/controller/OrganizationControllerDocs.java b/backEnd/src/main/java/com/quiz/ourclass/domain/organization/controller/OrganizationControllerDocs.java
index a49b3f15..76595537 100644
--- a/backEnd/src/main/java/com/quiz/ourclass/domain/organization/controller/OrganizationControllerDocs.java
+++ b/backEnd/src/main/java/com/quiz/ourclass/domain/organization/controller/OrganizationControllerDocs.java
@@ -16,6 +16,7 @@
 import io.swagger.v3.oas.annotations.media.Schema;
 import io.swagger.v3.oas.annotations.responses.ApiResponse;
 import io.swagger.v3.oas.annotations.tags.Tag;
+import java.util.List;
 import org.springframework.http.ResponseEntity;
 import org.springframework.web.bind.annotation.GetMapping;
 import org.springframework.web.bind.annotation.PatchMapping;
@@ -33,7 +34,7 @@ public interface OrganizationControllerDocs {
                 content = @Content(schema = @Schema(implementation = Long.class)))
         })
     @PostMapping
-    ResponseEntity<ResultResponse<?>> createOrganization(
+    ResponseEntity<ResultResponse<Long>> createOrganization(
         @RequestBody
         OrganizationRequest organizationRequest
     );
@@ -44,7 +45,7 @@ ResponseEntity<ResultResponse<?>> createOrganization(
                 content = @Content(schema = @Schema(implementation = OrganizationResponse.class)))
         })
     @GetMapping
-    ResponseEntity<ResultResponse<?>> getOrganizations(
+    ResponseEntity<ResultResponse<List<OrganizationResponse>>> getOrganizations(
     );
 
     @Operation(summary = "학급 가입코드 생성",
@@ -56,7 +57,7 @@ ResponseEntity<ResultResponse<?>> getOrganizations(
             @ApiResponse(responseCode = "404", description = "(message : \"멤버가 존재하지 않습니다.\")", content = @Content)
         })
     @GetMapping("/{id}/code")
-    ResponseEntity<ResultResponse<?>> getOrganizationCode(
+    ResponseEntity<ResultResponse<InviteCodeDTO>> getOrganizationCode(
         @PathVariable
         @Parameter(description = "학급 ID", required = true, in = ParameterIn.PATH)
         long id
@@ -81,7 +82,7 @@ ResponseEntity<ResultResponse<?>> getOrganizationCode(
                 """, content = @Content)
         })
     @PostMapping("/{id}/join")
-    ResponseEntity<ResultResponse<?>> joinOrganization(
+    ResponseEntity<ResultResponse<Long>> joinOrganization(
         @PathVariable
         @Parameter(description = "학급 ID", required = true, in = ParameterIn.PATH)
         long id,
@@ -96,7 +97,7 @@ ResponseEntity<ResultResponse<?>> joinOrganization(
             @ApiResponse(responseCode = "404", description = "(message : \"학급을 찾을 수 없습니다.\")", content = @Content)
         })
     @GetMapping("/{id}/members")
-    ResponseEntity<ResultResponse<?>> getOrganizationMembers(
+    ResponseEntity<ResultResponse<List<MemberSimpleDTO>>> getOrganizationMembers(
         @PathVariable
         @Parameter(description = "학급 ID", required = true, in = ParameterIn.PATH)
         long id
@@ -110,7 +111,7 @@ ResponseEntity<ResultResponse<?>> getOrganizationMembers(
             @ApiResponse(responseCode = "404", description = "(message : \"멤버가 존재하지 않습니다.\")", content = @Content)
         })
     @PatchMapping("/{id}")
-    ResponseEntity<ResultResponse<?>> updateOrganizationName(
+    ResponseEntity<ResultResponse<UpdateOrganizationResponse>> updateOrganizationName(
         @PathVariable
         @Parameter(description = "학급 ID", required = true, in = ParameterIn.PATH)
         long id,
@@ -124,7 +125,7 @@ ResponseEntity<ResultResponse<?>> updateOrganizationName(
                 content = @Content(schema = @Schema(implementation = MemberRankPoint.class)))
         })
     @GetMapping("/{id}/rank")
-    ResponseEntity<ResultResponse<?>> getRanking(
+    ResponseEntity<ResultResponse<List<MemberRankPoint>>> getRanking(
         @PathVariable
         @Parameter(description = "학급 ID", required = true, in = ParameterIn.PATH)
         long id
@@ -136,7 +137,7 @@ ResponseEntity<ResultResponse<?>> getRanking(
                 content = @Content(schema = @Schema(implementation = OrganizationSummaryResponse.class)))
         })
     @GetMapping("/{id}/summary")
-    ResponseEntity<ResultResponse<?>> getSummary(
+    ResponseEntity<ResultResponse<OrganizationSummaryResponse>> getSummary(
         @PathVariable
         @Parameter(description = "학급 ID", required = true, in = ParameterIn.PATH)
         long id
diff --git a/backEnd/src/main/java/com/quiz/ourclass/domain/organization/service/MemberOrgServiceImpl.java b/backEnd/src/main/java/com/quiz/ourclass/domain/organization/service/MemberOrgServiceImpl.java
index eddf7d2d..1a27bd83 100644
--- a/backEnd/src/main/java/com/quiz/ourclass/domain/organization/service/MemberOrgServiceImpl.java
+++ b/backEnd/src/main/java/com/quiz/ourclass/domain/organization/service/MemberOrgServiceImpl.java
@@ -142,8 +142,7 @@ public int tagGreeting(TagGreetingRequest tagGreetingRequest) {
         TagGreeting tagGreeting = TagGreeting.builder()
             .relationship(relationship).date(LocalDateTime.now()).build();
         tagGreetingRepository.save(tagGreeting);
-        int tagGreetingCount = relationship.updateTagGreetingCount();
-        return tagGreetingCount;
+        return relationship.updateTagGreetingCount();
     }
 
     private List<RelationSimpleResponse> getFriendlyResponse(long organizationId, long memberId,
diff --git a/backEnd/src/main/java/com/quiz/ourclass/domain/organization/service/OrganizationServiceImpl.java b/backEnd/src/main/java/com/quiz/ourclass/domain/organization/service/OrganizationServiceImpl.java
index 429e8185..2d46d931 100644
--- a/backEnd/src/main/java/com/quiz/ourclass/domain/organization/service/OrganizationServiceImpl.java
+++ b/backEnd/src/main/java/com/quiz/ourclass/domain/organization/service/OrganizationServiceImpl.java
@@ -26,6 +26,7 @@
 import com.quiz.ourclass.global.util.ConstantUtil;
 import com.quiz.ourclass.global.util.RedisUtil;
 import com.quiz.ourclass.global.util.UserAccessUtil;
+import java.security.SecureRandom;
 import java.time.Duration;
 import java.time.LocalDate;
 import java.util.List;
@@ -48,6 +49,7 @@ public class OrganizationServiceImpl implements OrganizationService {
     private final MemberMapper memberMapper;
     private final RedisUtil redisUtil;
     private final UserAccessUtil accessUtil;
+    private final Random rand = new SecureRandom();
 
     @Transactional
     @Override
@@ -98,8 +100,7 @@ public InviteCodeDTO getOrganizationCode(long id) {
         String redisKey = ConstantUtil.REDIS_ORG_KEY + id;
         String code = redisUtil.valueGet(redisKey);
         if (code == null || code.isEmpty()) {
-            Random random = new Random();
-            code = String.valueOf(random.nextInt(1000000));
+            code = String.valueOf(rand.nextInt(1000000));
             redisUtil.valueSet(redisKey, code,
                 Duration.ofMinutes(ConstantUtil.REDIS_ORG_ALIVE_MINUTE));
         }
diff --git a/backEnd/src/main/java/com/quiz/ourclass/domain/relay/controller/RelayController.java b/backEnd/src/main/java/com/quiz/ourclass/domain/relay/controller/RelayController.java
index 05c0d526..8b5e4dc3 100644
--- a/backEnd/src/main/java/com/quiz/ourclass/domain/relay/controller/RelayController.java
+++ b/backEnd/src/main/java/com/quiz/ourclass/domain/relay/controller/RelayController.java
@@ -28,33 +28,35 @@ public class RelayController implements RelayControllerDocs {
     private final RelayService relayService;
 
     @PostMapping
-    public ResponseEntity<ResultResponse<?>> createRelay(@RequestBody RelayRequest relayRequest) {
+    public ResponseEntity<ResultResponse<Long>> createRelay(
+        @RequestBody RelayRequest relayRequest) {
         long relayId = relayService.createRelay(relayRequest);
         return ResponseEntity.ok(ResultResponse.success(relayId));
     }
 
     @GetMapping
-    public ResponseEntity<ResultResponse<?>> getRelays(RelaySliceRequest relaySliceRequest) {
+    public ResponseEntity<ResultResponse<RelaySliceResponse>> getRelays(
+        RelaySliceRequest relaySliceRequest) {
         RelaySliceResponse relays = relayService.getRelays(relaySliceRequest);
         return ResponseEntity.ok(ResultResponse.success(relays));
     }
 
     @GetMapping("/{id}")
-    public ResponseEntity<ResultResponse<?>> getRelayDetail(@PathVariable long id) {
+    public ResponseEntity<ResultResponse<RelayResponse>> getRelayDetail(@PathVariable long id) {
         RelayResponse relay = relayService.getRelayDetail(id);
         return ResponseEntity.ok(ResultResponse.success(relay));
     }
 
     @GetMapping("/running")
-    public ResponseEntity<ResultResponse<?>> getRunningRelay(
-        @RequestParam(required = true) long organizationId) {
+    public ResponseEntity<ResultResponse<RunningRelayResponse>> getRunningRelay(
+        @RequestParam long organizationId) {
         RunningRelayResponse runningChallengeResponse = relayService.getRunningRelay(
             organizationId);
         return ResponseEntity.ok(ResultResponse.success(runningChallengeResponse));
     }
 
     @PostMapping("/{id}/receive")
-    public ResponseEntity<ResultResponse<?>> receiveRelay(@PathVariable long id,
+    public ResponseEntity<ResultResponse<ReceiveRelayResponse>> receiveRelay(@PathVariable long id,
         @RequestBody ReceiveRelayRequest receiveRelayRequest) {
         ReceiveRelayResponse receiveRelayResponse = relayService.receiveRelay(
             id, receiveRelayRequest);
@@ -62,13 +64,13 @@ public ResponseEntity<ResultResponse<?>> receiveRelay(@PathVariable long id,
     }
 
     @PostMapping("/{id}/send")
-    public ResponseEntity<ResultResponse<?>> sendRelay(@PathVariable long id) {
+    public ResponseEntity<ResultResponse<SendRelayResponse>> sendRelay(@PathVariable long id) {
         SendRelayResponse sendRelayResponse = relayService.sendRelay(id);
         return ResponseEntity.ok(ResultResponse.success(sendRelayResponse));
     }
 
     @GetMapping("/{id}/question")
-    public ResponseEntity<ResultResponse<?>> getRelayQuestion(@PathVariable long id) {
+    public ResponseEntity<ResultResponse<String>> getRelayQuestion(@PathVariable long id) {
         String question = relayService.getRelayQuestion(id);
         return ResponseEntity.ok(ResultResponse.success(question));
     }
diff --git a/backEnd/src/main/java/com/quiz/ourclass/domain/relay/controller/RelayControllerDocs.java b/backEnd/src/main/java/com/quiz/ourclass/domain/relay/controller/RelayControllerDocs.java
index 246827c6..289784ec 100644
--- a/backEnd/src/main/java/com/quiz/ourclass/domain/relay/controller/RelayControllerDocs.java
+++ b/backEnd/src/main/java/com/quiz/ourclass/domain/relay/controller/RelayControllerDocs.java
@@ -5,6 +5,7 @@
 import com.quiz.ourclass.domain.relay.dto.request.RelaySliceRequest;
 import com.quiz.ourclass.domain.relay.dto.response.ReceiveRelayResponse;
 import com.quiz.ourclass.domain.relay.dto.response.RelayResponse;
+import com.quiz.ourclass.domain.relay.dto.response.RelaySliceResponse;
 import com.quiz.ourclass.domain.relay.dto.response.RunningRelayResponse;
 import com.quiz.ourclass.domain.relay.dto.response.SendRelayResponse;
 import com.quiz.ourclass.global.dto.ResultResponse;
@@ -38,7 +39,7 @@ public interface RelayControllerDocs {
                 """, content = @Content)
         })
     @PostMapping
-    ResponseEntity<ResultResponse<?>> createRelay(
+    ResponseEntity<ResultResponse<Long>> createRelay(
         @RequestBody
         RelayRequest relayRequest
     );
@@ -50,7 +51,7 @@ ResponseEntity<ResultResponse<?>> createRelay(
                 content = @Content(schema = @Schema(implementation = RelaySliceRequest.class)))
         })
     @GetMapping
-    ResponseEntity<ResultResponse<?>> getRelays(RelaySliceRequest relaySliceRequest
+    ResponseEntity<ResultResponse<RelaySliceResponse>> getRelays(RelaySliceRequest relaySliceRequest
     );
 
     @Operation(summary = "이어달리기 상세 조회",
@@ -60,7 +61,7 @@ ResponseEntity<ResultResponse<?>> getRelays(RelaySliceRequest relaySliceRequest
                 content = @Content(schema = @Schema(implementation = RelayResponse.class)))
         })
     @GetMapping("/{id}")
-    ResponseEntity<ResultResponse<?>> getRelayDetail(
+    ResponseEntity<ResultResponse<RelayResponse>> getRelayDetail(
         @PathVariable
         @Parameter(description = "이어달리기 id", required = true, in = ParameterIn.PATH)
         long id
@@ -78,8 +79,8 @@ ResponseEntity<ResultResponse<?>> getRelayDetail(
                 """, content = @Content)
         })
     @GetMapping("/running")
-    ResponseEntity<ResultResponse<?>> getRunningRelay(
-        @RequestParam(required = true)
+    ResponseEntity<ResultResponse<RunningRelayResponse>> getRunningRelay(
+        @RequestParam
         @Parameter(description = "학급 id", required = true, in = ParameterIn.QUERY)
         long organizationId
     );
@@ -95,7 +96,7 @@ ResponseEntity<ResultResponse<?>> getRunningRelay(
                 """, content = @Content)
         })
     @PostMapping("/{id}/receive")
-    ResponseEntity<ResultResponse<?>> receiveRelay(
+    ResponseEntity<ResultResponse<ReceiveRelayResponse>> receiveRelay(
         @PathVariable
         @Parameter(description = "이어달리기 id", required = true, in = ParameterIn.PATH)
         long id,
@@ -116,7 +117,7 @@ ResponseEntity<ResultResponse<?>> receiveRelay(
                 """, content = @Content)
         })
     @PostMapping("/{id}/send")
-    ResponseEntity<ResultResponse<?>> sendRelay(
+    ResponseEntity<ResultResponse<SendRelayResponse>> sendRelay(
         @PathVariable
         @Parameter(description = "이어달리기 id", required = true, in = ParameterIn.PATH)
         long id
@@ -135,7 +136,7 @@ ResponseEntity<ResultResponse<?>> sendRelay(
                 """, content = @Content)
         })
     @GetMapping("/{id}/question")
-    ResponseEntity<ResultResponse<?>> getRelayQuestion(
+    ResponseEntity<ResultResponse<String>> getRelayQuestion(
         @PathVariable
         long id
     );
diff --git a/backEnd/src/main/java/com/quiz/ourclass/domain/relay/repository/RelayRepository.java b/backEnd/src/main/java/com/quiz/ourclass/domain/relay/repository/RelayRepository.java
index 332fe481..cb816d09 100644
--- a/backEnd/src/main/java/com/quiz/ourclass/domain/relay/repository/RelayRepository.java
+++ b/backEnd/src/main/java/com/quiz/ourclass/domain/relay/repository/RelayRepository.java
@@ -8,7 +8,7 @@
 
 public interface RelayRepository extends JpaRepository<Relay, Long>, RelayRepositoryQuerydsl {
 
-    Boolean existsByOrganizationAndEndStatusIsFalse(Organization organization);
+    boolean existsByOrganizationAndEndStatusIsFalse(Organization organization);
 
     Optional<Relay> findByOrganizationIdAndEndStatusIsFalse(long organizationId);
 
diff --git a/backEnd/src/main/java/com/quiz/ourclass/domain/relay/repository/RelayRepositoryQuerydslImpl.java b/backEnd/src/main/java/com/quiz/ourclass/domain/relay/repository/RelayRepositoryQuerydslImpl.java
index aba485bf..cc487ae3 100644
--- a/backEnd/src/main/java/com/quiz/ourclass/domain/relay/repository/RelayRepositoryQuerydslImpl.java
+++ b/backEnd/src/main/java/com/quiz/ourclass/domain/relay/repository/RelayRepositoryQuerydslImpl.java
@@ -46,7 +46,7 @@ public RelaySliceResponse getRelays(RelaySliceRequest request) {
             .join(relay.relayRunners, relayMember)
             .where(relayCondition)
             .offset(pageable.getOffset())
-            .limit(pageable.getPageSize() + 1)
+            .limit(pageable.getPageSize() + 1L)
             .orderBy(relay.id.desc())
             .fetch();
 
diff --git a/backEnd/src/main/java/com/quiz/ourclass/domain/relay/service/RelayServiceImpl.java b/backEnd/src/main/java/com/quiz/ourclass/domain/relay/service/RelayServiceImpl.java
index a2f83d3e..e59a7992 100644
--- a/backEnd/src/main/java/com/quiz/ourclass/domain/relay/service/RelayServiceImpl.java
+++ b/backEnd/src/main/java/com/quiz/ourclass/domain/relay/service/RelayServiceImpl.java
@@ -24,8 +24,10 @@
 import com.quiz.ourclass.global.util.FcmUtil;
 import com.quiz.ourclass.global.util.UserAccessUtil;
 import com.quiz.ourclass.global.util.scheduler.SchedulingService;
+import java.security.SecureRandom;
 import java.time.LocalDateTime;
 import java.util.List;
+import java.util.Random;
 import lombok.RequiredArgsConstructor;
 import org.springframework.boot.context.event.ApplicationReadyEvent;
 import org.springframework.context.event.EventListener;
@@ -44,6 +46,7 @@ public class RelayServiceImpl implements RelayService {
     private final UserAccessUtil accessUtil;
     private final SchedulingService schedulingService;
     private final FcmUtil fcmUtil;
+    private final Random random = new SecureRandom();
 
 
     @Transactional
@@ -54,7 +57,7 @@ public long createRelay(RelayRequest relayRequest) {
         Organization organization = organizationRepository.findById(relayRequest.organizationId())
             .orElseThrow(() -> new GlobalException(ErrorCode.ORGANIZATION_NOT_FOUND));
         int randomCount = organization.getMemberCount() / 2;
-        int totalCount = (int) (Math.random() * (randomCount + 1) + randomCount);
+        int totalCount = random.nextInt() * (randomCount + 1) + randomCount;
         if (relayRepository.existsByOrganizationAndEndStatusIsFalse(organization)) {
             throw new GlobalException(ErrorCode.EXIST_PROGRESS_RELAY);
         }
@@ -208,7 +211,7 @@ protected void relayClosing(RelayMember relayMember) {
 
     @EventListener(ApplicationReadyEvent.class)
     @Transactional
-    protected void relayClosingReload() {
+    public void relayClosingReload() {
         List<Relay> relays = relayRepository.findAllByEndStatusIsFalse();
         relays.forEach(relay -> {
             RelayMember lastRunner = relay.getLastRunner();
diff --git a/backEnd/src/main/java/com/quiz/ourclass/global/util/ConstantUtil.java b/backEnd/src/main/java/com/quiz/ourclass/global/util/ConstantUtil.java
index 87f4a5a1..3403d53d 100644
--- a/backEnd/src/main/java/com/quiz/ourclass/global/util/ConstantUtil.java
+++ b/backEnd/src/main/java/com/quiz/ourclass/global/util/ConstantUtil.java
@@ -18,6 +18,9 @@ public abstract class ConstantUtil {
     public static final String RANKING = "ranking";
     public static final String QUIZ_ANSWER = "answer";
     public static final String AUTHORIZATION = "Authorization";
+    public static final String REDIS_GROUP_KEY = "CHALLENGE_LEADER:";
+    public static final Long DEFAULT_TIMEOUT = 60L * 1000 * 20;
+    public static final Long REDIRECT_TIME = 5L * 1000;
 
     // 인스턴스화 방지
     private ConstantUtil() {