diff --git a/src/decorators/docs/friendship.decorator.ts b/src/decorators/docs/friendship.decorator.ts
index f167404..d006422 100644
--- a/src/decorators/docs/friendship.decorator.ts
+++ b/src/decorators/docs/friendship.decorator.ts
@@ -15,9 +15,9 @@ import { SendFriendshipRequestDto } from 'src/friendship/dto/send-friendship-req
 import { SendFriendshipResponseDto } from 'src/friendship/dto/send-friendship-response.dto';
 import { UpdateFriendshipResponseDto } from 'src/friendship/dto/update-friendship-response.dto';
 import { FriendshipController } from 'src/friendship/friendship.controller';
-import { GetTimetableByTimetableIdDto } from 'src/timetable/dto/get-timetable-timetable.dto';
 import { ApiKukeyExceptionResponse } from '../api-kukey-exception-response';
 import { GetReceivedFriendshipRequestCountDto } from 'src/friendship/dto/get-received-friendship-request-count.dto';
+import { GetNullableTimetableResponseDto } from 'src/timetable/dto/get-nullable-timetable-response.dto';
 
 type FriendshipEndPoints = MethodNames<FriendshipController>;
 
@@ -79,14 +79,12 @@ const FriendshipDocsMap: Record<FriendshipEndPoints, MethodDecorator[]> = {
     }),
     ApiOkResponse({
       description: '친구 시간표 반환',
-      type: GetTimetableByTimetableIdDto,
-      isArray: true,
+      type: GetNullableTimetableResponseDto,
     }),
     ApiKukeyExceptionResponse([
       'USER_NOT_FOUND',
       'FRIENDSHIP_NOT_FOUND',
       'FRIENDSHIP_REQUEST_NOT_ACCEPTED',
-      'FRIEND_TIMETABLE_NOT_FOUND',
     ]),
   ],
   sendFriendshipRequest: [
diff --git a/src/decorators/docs/timetable.decorator.ts b/src/decorators/docs/timetable.decorator.ts
index 47edf2c..638d88d 100644
--- a/src/decorators/docs/timetable.decorator.ts
+++ b/src/decorators/docs/timetable.decorator.ts
@@ -10,7 +10,6 @@ import { CommonDeleteResponseDto } from 'src/timetable/dto/common-delete-respons
 import { CommonTimetableResponseDto } from 'src/timetable/dto/common-timetable-response.dto';
 import { CreateTimetableCourseResponseDto } from 'src/timetable/dto/create-timetable-course-response.dto';
 import { CreateTimetableDto } from 'src/timetable/dto/create-timetable.dto';
-import { GetTimetableByTimetableIdDto } from 'src/timetable/dto/get-timetable-timetable.dto';
 import { TimetableDto } from 'src/timetable/dto/timetable.dto';
 import { UpdateTimetableColorDto } from 'src/timetable/dto/update-timetable-color.dto';
 import { UpdateTimetableNameDto } from 'src/timetable/dto/update-timetable-name.dto';
@@ -18,6 +17,7 @@ import { GetTimetableByUserIdResponseDto } from 'src/timetable/dto/userId-timeta
 import { TimetableController } from 'src/timetable/timetable.controller';
 import { ApiKukeyExceptionResponse } from '../api-kukey-exception-response';
 import { GetTodayTimetableResponse } from 'src/timetable/dto/get-today-timetable-response.dto';
+import { GetNullableTimetableResponseDto } from 'src/timetable/dto/get-nullable-timetable-response.dto';
 
 type TimetableEndPoints = MethodNames<TimetableController>;
 
@@ -48,7 +48,9 @@ const TimetableDocsMap: Record<TimetableEndPoints, MethodDecorator[]> = {
     ApiKukeyExceptionResponse([
       'TIMETABLE_NOT_FOUND',
       'COURSE_NOT_FOUND',
+      'TIMETABLE_COURSE_MISMATCH',
       'COURSE_ALREADY_EXIST',
+      'COURSE_CONFLICT',
     ]),
   ],
   createTimetable: [
@@ -89,7 +91,6 @@ const TimetableDocsMap: Record<TimetableEndPoints, MethodDecorator[]> = {
       description: '대표 시간표 조회 성공 시',
       type: CommonTimetableResponseDto,
     }),
-    ApiKukeyExceptionResponse(['TIMETABLE_NOT_FOUND']),
   ],
   getTimetableByUserId: [
     ApiOperation({
@@ -103,7 +104,6 @@ const TimetableDocsMap: Record<TimetableEndPoints, MethodDecorator[]> = {
       type: GetTimetableByUserIdResponseDto,
       isArray: true,
     }),
-    ApiKukeyExceptionResponse(['TIMETABLE_NOT_FOUND']),
   ],
   getTodayTimetable: [
     ApiOperation({
@@ -136,14 +136,15 @@ const TimetableDocsMap: Record<TimetableEndPoints, MethodDecorator[]> = {
     }),
     ApiParam({
       name: 'timetableId',
+      type: 'number',
+      required: true,
       description: '특정 시간표 ID',
     }),
     ApiResponse({
       status: 200,
       description: '특정 시간표 ID로 조회 성공 시',
-      type: GetTimetableByTimetableIdDto,
+      type: GetNullableTimetableResponseDto,
     }),
-    ApiKukeyExceptionResponse(['TIMETABLE_NOT_FOUND']),
   ],
   deleteTimetableCourse: [
     ApiOperation({
@@ -177,6 +178,8 @@ const TimetableDocsMap: Record<TimetableEndPoints, MethodDecorator[]> = {
     }),
     ApiParam({
       name: 'timetableId',
+      type: 'number',
+      required: true,
       description: '삭제할 시간표 ID',
     }),
     ApiResponse({
@@ -193,6 +196,8 @@ const TimetableDocsMap: Record<TimetableEndPoints, MethodDecorator[]> = {
     }),
     ApiParam({
       name: 'timetableId',
+      type: 'number',
+      required: true,
       description: '변경할 시간표 ID',
     }),
     ApiBody({
@@ -212,6 +217,8 @@ const TimetableDocsMap: Record<TimetableEndPoints, MethodDecorator[]> = {
     }),
     ApiParam({
       name: 'timetableId',
+      type: 'number',
+      required: true,
       description: '변경할 시간표 ID',
     }),
     ApiBody({
@@ -232,6 +239,8 @@ const TimetableDocsMap: Record<TimetableEndPoints, MethodDecorator[]> = {
     }),
     ApiParam({
       name: 'timetableId',
+      type: 'number',
+      required: true,
       description: '대표 시간표로 변경할 시간표 ID',
     }),
     ApiBody({
diff --git a/src/friendship/friendship.controller.ts b/src/friendship/friendship.controller.ts
index 59bd45e..4699e01 100644
--- a/src/friendship/friendship.controller.ts
+++ b/src/friendship/friendship.controller.ts
@@ -23,13 +23,13 @@ import { DeleteFriendshipResponseDto } from './dto/delete-friendship-response.dt
 import { SearchUserResponseDto } from './dto/search-user-response.dto';
 import { ApiBearerAuth, ApiTags } from '@nestjs/swagger';
 import { GetFriendTimetableRequestDto } from './dto/get-friend-timetable.dto';
-import { GetTimetableByTimetableIdDto } from 'src/timetable/dto/get-timetable-timetable.dto';
 import { TransactionInterceptor } from 'src/common/interceptors/transaction.interceptor';
 import { TransactionManager } from 'src/decorators/manager.decorator';
 import { EntityManager } from 'typeorm';
 import { SearchUserRequestDto } from './dto/search-user-query.dto';
 import { FriendshipDocs } from 'src/decorators/docs/friendship.decorator';
 import { GetReceivedFriendshipRequestCountDto } from './dto/get-received-friendship-request-count.dto';
+import { GetNullableTimetableResponseDto } from 'src/timetable/dto/get-nullable-timetable-response.dto';
 
 @Controller('friendship')
 @ApiTags('friendship')
@@ -64,7 +64,7 @@ export class FriendshipController {
   async getFriendTimetable(
     @User() user: AuthorizedUserDto,
     @Query() getFriendTimetableRequestDto: GetFriendTimetableRequestDto,
-  ): Promise<GetTimetableByTimetableIdDto> {
+  ): Promise<GetNullableTimetableResponseDto> {
     return await this.friendshipService.getFriendTimetable(
       user.id,
       getFriendTimetableRequestDto,
diff --git a/src/friendship/friendship.service.ts b/src/friendship/friendship.service.ts
index 6d8bc99..7719e6b 100644
--- a/src/friendship/friendship.service.ts
+++ b/src/friendship/friendship.service.ts
@@ -11,7 +11,6 @@ import { FriendshipEntity } from 'src/entities/friendship.entity';
 import { UserService } from 'src/user/user.service';
 import { TimetableService } from 'src/timetable/timetable.service';
 import { GetFriendTimetableRequestDto } from './dto/get-friend-timetable.dto';
-import { GetTimetableByTimetableIdDto } from 'src/timetable/dto/get-timetable-timetable.dto';
 import { GetWaitingFriendResponseDto } from './dto/get-waiting-friend-response.dto';
 import { EntityManager } from 'typeorm';
 import { NoticeService } from 'src/notice/notice.service';
@@ -19,6 +18,7 @@ import { Notice } from 'src/notice/enum/notice.enum';
 import { AuthorizedUserDto } from 'src/auth/dto/authorized-user-dto';
 import { SearchUserRequestDto } from './dto/search-user-query.dto';
 import { throwKukeyException } from 'src/utils/exception.util';
+import { GetNullableTimetableResponseDto } from 'src/timetable/dto/get-nullable-timetable-response.dto';
 
 @Injectable()
 export class FriendshipService {
@@ -367,7 +367,7 @@ export class FriendshipService {
   async getFriendTimetable(
     userId: number,
     getFriendTimetableRequestDto: GetFriendTimetableRequestDto,
-  ): Promise<GetTimetableByTimetableIdDto> {
+  ): Promise<GetNullableTimetableResponseDto> {
     // username으로 친구정보 가져오기
     const friend = await this.userService.findUserByUsername(
       getFriendTimetableRequestDto.username,
@@ -397,9 +397,6 @@ export class FriendshipService {
       getFriendTimetableRequestDto.year,
     );
 
-    if (!friendTimetable) {
-      throwKukeyException('FRIEND_TIMETABLE_NOT_FOUND');
-    }
     return friendTimetable;
   }
 }
diff --git a/src/timetable/dto/get-nullable-timetable-response.dto.ts b/src/timetable/dto/get-nullable-timetable-response.dto.ts
new file mode 100644
index 0000000..1294bb1
--- /dev/null
+++ b/src/timetable/dto/get-nullable-timetable-response.dto.ts
@@ -0,0 +1,15 @@
+import { ApiProperty } from '@nestjs/swagger';
+import { GetTimetableByTimetableIdDto } from './get-timetable-timetable.dto';
+
+export class GetNullableTimetableResponseDto {
+  @ApiProperty({
+    description: '특정 시간표 정보',
+    type: GetTimetableByTimetableIdDto,
+    nullable: true,
+  })
+  timetable: GetTimetableByTimetableIdDto | null;
+
+  constructor(timetable: GetTimetableByTimetableIdDto | null) {
+    this.timetable = timetable;
+  }
+}
diff --git a/src/timetable/timetable.controller.ts b/src/timetable/timetable.controller.ts
index f39c507..413e097 100644
--- a/src/timetable/timetable.controller.ts
+++ b/src/timetable/timetable.controller.ts
@@ -22,13 +22,13 @@ import { ApiBearerAuth, ApiTags } from '@nestjs/swagger';
 import { CreateTimetableCourseResponseDto } from './dto/create-timetable-course-response.dto';
 import { CommonTimetableResponseDto } from './dto/common-timetable-response.dto';
 import { CommonDeleteResponseDto } from './dto/common-delete-response.dto';
-import { GetTimetableByTimetableIdDto } from './dto/get-timetable-timetable.dto';
 import { UpdateTimetableColorDto } from './dto/update-timetable-color.dto';
 import { TransactionInterceptor } from 'src/common/interceptors/transaction.interceptor';
 import { TransactionManager } from 'src/decorators/manager.decorator';
 import { EntityManager } from 'typeorm';
 import { TimetableDocs } from 'src/decorators/docs/timetable.decorator';
 import { GetTodayTimetableResponse } from './dto/get-today-timetable-response.dto';
+import { GetNullableTimetableResponseDto } from './dto/get-nullable-timetable-response.dto';
 
 @Controller('timetable')
 @ApiTags('timetable')
@@ -98,7 +98,7 @@ export class TimetableController {
   async getTimetableByTimetableId(
     @Param('timetableId') timetableId: number,
     @User() user: AuthorizedUserDto,
-  ): Promise<GetTimetableByTimetableIdDto> {
+  ): Promise<GetNullableTimetableResponseDto> {
     return await this.timetableService.getTimetableByTimetableId(
       timetableId,
       user.id,
diff --git a/src/timetable/timetable.service.ts b/src/timetable/timetable.service.ts
index 041cdec..abc5b26 100644
--- a/src/timetable/timetable.service.ts
+++ b/src/timetable/timetable.service.ts
@@ -19,6 +19,7 @@ import { DayType } from 'src/common/types/day-type.utils';
 import { throwKukeyException } from 'src/utils/exception.util';
 import { DeleteTimetableResponseDto } from './dto/delete-timetable-response.dto';
 import { GetTodayTimetableResponse } from './dto/get-today-timetable-response.dto';
+import { GetNullableTimetableResponseDto } from './dto/get-nullable-timetable-response.dto';
 
 @Injectable()
 export class TimetableService {
@@ -226,7 +227,7 @@ export class TimetableService {
   async getTimetableByTimetableId(
     timetableId: number,
     userId: number,
-  ): Promise<GetTimetableByTimetableIdDto> {
+  ): Promise<GetNullableTimetableResponseDto> {
     const timetable = await this.timetableRepository.findOne({
       where: { id: timetableId, userId },
       relations: [
@@ -235,8 +236,9 @@ export class TimetableService {
         'timetableCourses.course.courseDetails',
       ],
     });
+
     if (!timetable) {
-      throwKukeyException('TIMETABLE_NOT_FOUND');
+      return new GetNullableTimetableResponseDto(null);
     }
 
     const schedules =
@@ -306,7 +308,9 @@ export class TimetableService {
       });
     });
 
-    return getTimetableByTimetableIdResponse;
+    return new GetNullableTimetableResponseDto(
+      getTimetableByTimetableIdResponse,
+    );
   }
 
   async getTimetableByUserId(
@@ -315,7 +319,11 @@ export class TimetableService {
     const userTimetable = await this.timetableRepository.find({
       where: { userId },
     });
-    if (!userTimetable) throwKukeyException('TIMETABLE_NOT_FOUND');
+
+    if (!userTimetable) {
+      return [];
+    }
+
     return userTimetable.map(
       (table) => new GetTimetableByUserIdResponseDto(table),
     );
@@ -326,7 +334,7 @@ export class TimetableService {
     friendId: number,
     semester: string,
     year: string,
-  ): Promise<GetTimetableByTimetableIdDto> {
+  ): Promise<GetNullableTimetableResponseDto> {
     const timetable = await this.timetableRepository.findOne({
       where: {
         userId: friendId,
@@ -336,10 +344,7 @@ export class TimetableService {
       },
     });
 
-    // 시간표가 없을 경우
-    if (!timetable) {
-      throwKukeyException('TIMETABLE_NOT_FOUND');
-    }
+    if (!timetable) return new GetNullableTimetableResponseDto(null);
 
     // 시간표 id 추출 후 구현해놓은 함수 사용
     const friendTimetableId = timetable.id;
diff --git a/src/utils/exception.util.ts b/src/utils/exception.util.ts
index 8b33203..0ced9ba 100644
--- a/src/utils/exception.util.ts
+++ b/src/utils/exception.util.ts
@@ -466,12 +466,6 @@ export const kukeyExceptions = createKukeyExceptions({
     errorCode: 3409,
     statusCode: 500,
   },
-  FRIEND_TIMETABLE_NOT_FOUND: {
-    name: 'FRIEND_TIMETABLE_NOT_FOUND',
-    message: "Friend's timetable not found.",
-    errorCode: 3410,
-    statusCode: 404,
-  },
   // 4xxx : 커뮤니티 관련 예외
   // - 40xx : Board
   BOARD_NOT_FOUND: {