diff --git a/src/main/java/com/gam/api/common/ErrorHandler.java b/src/main/java/com/gam/api/common/ErrorHandler.java
index 8dc18302..3c9b3ed8 100644
--- a/src/main/java/com/gam/api/common/ErrorHandler.java
+++ b/src/main/java/com/gam/api/common/ErrorHandler.java
@@ -33,7 +33,7 @@ public ResponseEntity<ApiResponse> handleIllegalArgumentException(IllegalArgumen
 
     @ExceptionHandler(MethodArgumentNotValidException.class)
     public ResponseEntity<ApiResponse> handleMethodArgumentNotValidException(MethodArgumentNotValidException exception){
-        ApiResponse response = ApiResponse.fail(EMPTY_METHOD_ARGUMENT.getMessage());
+        ApiResponse response = ApiResponse.fail(exception.getBindingResult().getAllErrors().get(0).getDefaultMessage());
         return new ResponseEntity<>(response, HttpStatus.BAD_REQUEST);
     }
 
diff --git a/src/main/java/com/gam/api/domain/admin/controller/AdminController.java b/src/main/java/com/gam/api/domain/admin/controller/AdminController.java
index 43e60df0..134d322a 100644
--- a/src/main/java/com/gam/api/domain/admin/controller/AdminController.java
+++ b/src/main/java/com/gam/api/domain/admin/controller/AdminController.java
@@ -6,6 +6,7 @@
 import com.gam.api.domain.user.entity.GamUserDetails;
 import com.gam.api.domain.admin.service.AdminService;
 import io.swagger.annotations.ApiOperation;
+import javax.validation.Valid;
 import lombok.RequiredArgsConstructor;
 import lombok.val;
 import org.springframework.http.ResponseEntity;
@@ -50,7 +51,7 @@ public ResponseEntity<ApiResponse> getMagazineDetail(@RequestParam Long magazine
 
     @ApiOperation(value = "매거진 - 수정")
     @PatchMapping("/magazine/{magazineId}")
-    public ResponseEntity<ApiResponse> editMagazine(@PathVariable Long magazineId, @RequestBody MagazineRequestDTO request) {
+    public ResponseEntity<ApiResponse> editMagazine(@PathVariable Long magazineId, @Valid @RequestBody MagazineRequestDTO request) {
         adminService.editMagazine(magazineId, request);
         return ResponseEntity.ok(ApiResponse.success(ResponseMessage.SUCCESS_EDIT_MAGAZINE.getMessage()));
     }
diff --git a/src/main/java/com/gam/api/domain/admin/dto/magazine/request/MagazineRequestDTO.java b/src/main/java/com/gam/api/domain/admin/dto/magazine/request/MagazineRequestDTO.java
index 0fff0b19..e2c0f83f 100644
--- a/src/main/java/com/gam/api/domain/admin/dto/magazine/request/MagazineRequestDTO.java
+++ b/src/main/java/com/gam/api/domain/admin/dto/magazine/request/MagazineRequestDTO.java
@@ -7,20 +7,18 @@
 import java.util.List;
 
 public record MagazineRequestDTO(
-        @NotNull
-        @NotBlank
+        @NotNull(message = "magazine title은 null일 수 없습니다.")
+        @NotBlank(message = "magazine title은 빈스트링 일 수 없습니다.")
         String title,
-        @NotNull
-        @NotBlank
+        @NotNull(message = "magazine photo는 null일 수 없습니다.")
         List<String> magazinePhotos,
-        @NotNull
-        @NotBlank
+        @NotNull(message = "magazine intro는 null일 수 없습니다.")
+        @NotBlank(message = "magazine intro는 빈스트링 일 수 없습니다.")
         String magazineIntro,
-        @NotNull
-        @NotBlank
+        @NotNull(message = "magazine interviewPerson은 null일 수 없습니다.")
+        @NotBlank(message = "magazine interviewPerson은 빈스트링 일 수 없습니다.")
         String interviewPerson,
-        @NotNull
-        @NotBlank
+        @NotNull(message = "magazine questions는 null일 수 없습니다.")
         List<QuestionVO> questions
 ) {
     @Builder
diff --git a/src/main/java/com/gam/api/domain/admin/service/AdminServiceImpl.java b/src/main/java/com/gam/api/domain/admin/service/AdminServiceImpl.java
index 2604b593..8dba72e6 100644
--- a/src/main/java/com/gam/api/domain/admin/service/AdminServiceImpl.java
+++ b/src/main/java/com/gam/api/domain/admin/service/AdminServiceImpl.java
@@ -3,6 +3,7 @@
 
 import com.gam.api.common.message.ExceptionMessage;
 import com.gam.api.domain.admin.dto.magazine.request.MagazineRequestDTO;
+import com.gam.api.domain.admin.dto.magazine.request.MagazineRequestDTO.QuestionVO;
 import com.gam.api.domain.admin.dto.magazine.response.MagazineListResponseDTO;
 
 import com.gam.api.domain.admin.dto.magazine.response.MagazineDetailResponseDTO;
@@ -13,6 +14,10 @@
 import com.gam.api.domain.magazine.repository.QuestionRepository;
 import com.gam.api.domain.user.repository.UserRepository;
 import com.gam.api.domain.work.repository.WorkRepository;
+import java.util.ArrayList;
+import java.util.Collections;
+import javax.persistence.EntityManager;
+import javax.persistence.EntityManagerFactory;
 import lombok.RequiredArgsConstructor;
 import lombok.val;
 import org.springframework.stereotype.Service;
@@ -27,9 +32,9 @@
 public class AdminServiceImpl implements AdminService {
 
     private final MagazineRepository magazineRepository;
-    private final QuestionRepository questionRepository;
     private final UserRepository userRepository;
     private final WorkRepository workRepository;
+    private final int MAX_MAGAZINE_PHOTO_COUNT = 4;
 
     @Override
     public List<MagazineListResponseDTO> getMagazines() {
@@ -49,7 +54,7 @@ public void deleteMagazine(Long magazineId) {
     @Override
     public void createMagazine(MagazineRequestDTO request) {
         val mainPhotoCount = request.magazinePhotos().size();
-        if (mainPhotoCount > 4) {
+        if (mainPhotoCount > MAX_MAGAZINE_PHOTO_COUNT) {
             throw new IllegalArgumentException(ExceptionMessage.INVALID_MAIN_PHOTOS_COUNT.getMessage());
         }
 
@@ -64,104 +69,74 @@ public void createMagazine(MagazineRequestDTO request) {
         val magazinePhotos = request.magazinePhotos().toArray(new String[request.magazinePhotos().size()]);
         magazine.setMagazine_photos(magazinePhotos);
 
-        request.questions().stream()
-                .map((questionVO) -> {
-                            Question question = Question.builder()
-                                    .questionOrder(questionVO.questionOrder())
-                                    .question(questionVO.question())
-                                    .answer(questionVO.answer())
-                                    .build();
-
-                            if (questionVO.answerImage() == "") {
-                                question.setAnswerImage(null);
-                                question.setImageCaption(null);
-                            } else {
-                                question.setAnswerImage(questionVO.answerImage());
-                                question.setImageCaption(questionVO.imageCaption());
-                            }
-                            question.setMagazine(magazine);
-                            return question;
-                }).collect(Collectors.toList());
+        toQuestionEntity(magazine, request.questions());
     }
 
     @Override
+    @Transactional
     public void editMagazine(Long magazineId, MagazineRequestDTO request) {
         val magazine = magazineRepository.findById(magazineId)
-                .orElseThrow(()-> new EntityNotFoundException());
+                .orElseThrow(() -> new EntityNotFoundException());
 
-        if (magazine.getMagazineTitle() != request.title()) {
-            magazine.setMagazineTitle(request.title());
-        }
-        if (magazine.getIntroduction() != request.magazineIntro()) {
-            magazine.setIntroduction(request.magazineIntro());
-        }
-        if (magazine.getInterviewPerson() != request.interviewPerson()) {
-            magazine.setInterviewPerson(request.interviewPerson());
-        }
+        magazine.setMagazineTitle(request.title());
+        magazine.setIntroduction(request.magazineIntro());
+        magazine.setInterviewPerson(request.interviewPerson());
 
         val magazinePhotos = request.magazinePhotos().toArray(new String[request.magazinePhotos().size()]);
         magazine.setMagazine_photos(magazinePhotos);
         magazineRepository.save(magazine);
 
-        val currentQuestions = magazine.getQuestions();
-        val requestQuestions = request.questions().stream()
-                .map((questionVO) -> {
+        List<Question> currentQuestions = new ArrayList<>(magazine.getQuestions());
+        Collections.sort(request.questions(), (q1, q2) -> Integer.compare(q1.questionOrder(), q2.questionOrder()));
+
+        int requestQuestionSize = request.questions().size();
+
+        if(requestQuestionSize <= currentQuestions.size()) { // 질문이 삭제 됐을 경우
+            for (int i = 0; i < requestQuestionSize; i++) {
+                updateQuestionDetails(currentQuestions.get(i), request.questions().get(i));
+            }
+            if(requestQuestionSize < currentQuestions.size()) {
+                magazine.getQuestions().removeAll(currentQuestions.subList(request.questions().size(), currentQuestions.size()));
+            }
+            return;
+        }
+
+        for (int i = 0; i < currentQuestions.size(); i++) { // 질문이 추가 될 경우
+            updateQuestionDetails(currentQuestions.get(i), request.questions().get(i));
+        }
+        List<QuestionVO> createQuestion = request.questions().subList(currentQuestions.size(), request.questions().size());
+        toQuestionEntity(magazine, createQuestion);
+    }
+
+    private void updateQuestionDetails(Question oldQuestion, QuestionVO newQuestion) {
+        oldQuestion.setQuestionOrder(newQuestion.questionOrder());
+        oldQuestion.setQuestion(newQuestion.question());
+        oldQuestion.setAnswer(newQuestion.answer());
+        oldQuestion.setAnswerImage(newQuestion.answerImage());
+        oldQuestion.setImageCaption(newQuestion.imageCaption());
+    }
+
+    @Transactional
+    public void toQuestionEntity(Magazine magazine, List<QuestionVO> request) {
+        request.stream()
+                .forEach((questionVO) -> {
                     Question question = Question.builder()
                             .questionOrder(questionVO.questionOrder())
                             .question(questionVO.question())
                             .answer(questionVO.answer())
                             .build();
 
-                    if (questionVO.answerImage() == "") {
+                    if (questionVO.answerImage().isBlank()) {
                         question.setAnswerImage(null);
                         question.setImageCaption(null);
                     } else {
                         question.setAnswerImage(questionVO.answerImage());
                         question.setImageCaption(questionVO.imageCaption());
                     }
-                    return question;
-                }).collect(Collectors.toList());
-
-        checkEntityDiff(currentQuestions, requestQuestions);
-
-        if (currentQuestions.size() < requestQuestions.size()) {
-            val createCount = requestQuestions.size() - currentQuestions.size();
-            val currentQuestionSize = currentQuestions.size();
-            for (int i = 0 ; i<createCount; i++) {
-                val createQuestion = questionRepository.save(requestQuestions.get(currentQuestionSize+i));
-                createQuestion.setMagazine(magazine);
-            }
-        }
-        questionRepository.saveAll(currentQuestions);
-    }
-    private List<Question> checkEntityDiff(List<Question> currentQuestions, List<Question> requestQuestions) {
-        val changeSize = currentQuestions.size();
-        for (int i = 0; i<changeSize; i++) {
-            if (!currentQuestions.get(i).equals(requestQuestions.get(i))) {
-                editChangeQuestion(currentQuestions.get(i), requestQuestions.get(i));
-            }
-        }
-        return currentQuestions;
+                    question.setMagazine(magazine);
+                });
     }
 
-    private Question editChangeQuestion(Question currentEntity, Question requestEntity) {
-        if (currentEntity.getQuestionOrder() != requestEntity.getQuestionOrder()) {
-            currentEntity.setQuestionOrder(requestEntity.getQuestionOrder());
-        }
-        if (currentEntity.getQuestion() != requestEntity.getQuestion()) {
-            currentEntity.setQuestion(requestEntity.getQuestion());
-        }
-        if (currentEntity.getAnswer() != requestEntity.getAnswer()) {
-            currentEntity.setAnswer(requestEntity.getAnswer());
-        }
-        if (currentEntity.getAnswerImage() != requestEntity.getAnswerImage()) {
-            currentEntity.setAnswerImage(requestEntity.getAnswerImage());
-        }
-        if (currentEntity.getImageCaption() != requestEntity.getImageCaption()) {
-            currentEntity.setImageCaption(requestEntity.getImageCaption());
-        }
-        return currentEntity;
-    }
 
     @Override
     public void deleteUserAccount(Long userId) {
diff --git a/src/main/java/com/gam/api/domain/magazine/entity/Magazine.java b/src/main/java/com/gam/api/domain/magazine/entity/Magazine.java
index 20dc0265..20851d9c 100644
--- a/src/main/java/com/gam/api/domain/magazine/entity/Magazine.java
+++ b/src/main/java/com/gam/api/domain/magazine/entity/Magazine.java
@@ -60,8 +60,6 @@ public class Magazine extends TimeStamped {
 
     public void scrapCountDown(){ this.scrapCount -= 1; }
 
-    public void setQuestions(List<Question> questions) { this.questions = questions; }
-
     @Builder
     public Magazine(String thumbNail, String magazineTitle, String introduction, String interviewPerson) {
         this.thumbNail = thumbNail;
diff --git a/src/main/java/com/gam/api/domain/magazine/entity/Question.java b/src/main/java/com/gam/api/domain/magazine/entity/Question.java
index 98297de5..1894962c 100644
--- a/src/main/java/com/gam/api/domain/magazine/entity/Question.java
+++ b/src/main/java/com/gam/api/domain/magazine/entity/Question.java
@@ -70,4 +70,17 @@ public boolean equals(Object o) {
     public int hashCode() {
         return Objects.hash(getQuestionOrder(), getQuestion(), getAnswer(), getAnswerImage(), getImageCaption());
     }
+
+    @Override
+    public String toString() {
+        return "Question{" +
+                "id=" + id +
+                ", magazine=" + magazine +
+                ", questionOrder=" + questionOrder +
+                ", question='" + question + '\'' +
+                ", answer='" + answer + '\'' +
+                ", answerImage='" + answerImage + '\'' +
+                ", imageCaption='" + imageCaption + '\'' +
+                '}';
+    }
 }
diff --git a/src/main/java/com/gam/api/domain/report/dto/request/ReportCreateRequestDTO.java b/src/main/java/com/gam/api/domain/report/dto/request/ReportCreateRequestDTO.java
index 01c98983..5dd83962 100644
--- a/src/main/java/com/gam/api/domain/report/dto/request/ReportCreateRequestDTO.java
+++ b/src/main/java/com/gam/api/domain/report/dto/request/ReportCreateRequestDTO.java
@@ -5,8 +5,8 @@
 
 public record ReportCreateRequestDTO (
         Long targetUserId,
-        @NotBlank
-        @NotNull
+        @NotBlank(message = "신고내용은 빈스트링일 수 없습니다.")
+        @NotNull(message = "신고내용은 null일 수 없습니다.")
         String content,
         Long workId
 ){
diff --git a/src/main/java/com/gam/api/external/s3/controller/S3Controller.java b/src/main/java/com/gam/api/domain/s3/controller/S3Controller.java
similarity index 87%
rename from src/main/java/com/gam/api/external/s3/controller/S3Controller.java
rename to src/main/java/com/gam/api/domain/s3/controller/S3Controller.java
index fb5fafe3..dd602592 100644
--- a/src/main/java/com/gam/api/external/s3/controller/S3Controller.java
+++ b/src/main/java/com/gam/api/domain/s3/controller/S3Controller.java
@@ -1,8 +1,8 @@
-package com.gam.api.external.s3.controller;
+package com.gam.api.domain.s3.controller;
 
 import com.gam.api.common.message.ResponseMessage;
-import com.gam.api.external.s3.dto.request.PresignedRequestDTO;
-import com.gam.api.external.s3.service.S3ServiceImpl;
+import com.gam.api.domain.s3.dto.request.PresignedRequestDTO;
+import com.gam.api.domain.s3.service.S3ServiceImpl;
 import io.swagger.annotations.ApiOperation;
 import lombok.RequiredArgsConstructor;
 import lombok.val;
diff --git a/src/main/java/com/gam/api/external/s3/dto/request/ImageDeleteRequestDTO.java b/src/main/java/com/gam/api/domain/s3/dto/request/ImageDeleteRequestDTO.java
similarity index 56%
rename from src/main/java/com/gam/api/external/s3/dto/request/ImageDeleteRequestDTO.java
rename to src/main/java/com/gam/api/domain/s3/dto/request/ImageDeleteRequestDTO.java
index ed3261c0..72eadc1d 100644
--- a/src/main/java/com/gam/api/external/s3/dto/request/ImageDeleteRequestDTO.java
+++ b/src/main/java/com/gam/api/domain/s3/dto/request/ImageDeleteRequestDTO.java
@@ -1,4 +1,4 @@
-package com.gam.api.external.s3.dto.request;
+package com.gam.api.domain.s3.dto.request;
 
 public record ImageDeleteRequestDTO(String fileName) {
 }
diff --git a/src/main/java/com/gam/api/external/s3/dto/request/PresignedRequestDTO.java b/src/main/java/com/gam/api/domain/s3/dto/request/PresignedRequestDTO.java
similarity index 65%
rename from src/main/java/com/gam/api/external/s3/dto/request/PresignedRequestDTO.java
rename to src/main/java/com/gam/api/domain/s3/dto/request/PresignedRequestDTO.java
index dbd2d4d2..0cd881a9 100644
--- a/src/main/java/com/gam/api/external/s3/dto/request/PresignedRequestDTO.java
+++ b/src/main/java/com/gam/api/domain/s3/dto/request/PresignedRequestDTO.java
@@ -1,4 +1,4 @@
-package com.gam.api.external.s3.dto.request;
+package com.gam.api.domain.s3.dto.request;
 
 import java.util.List;
 
diff --git a/src/main/java/com/gam/api/external/s3/dto/response/PresignedResponseDTO.java b/src/main/java/com/gam/api/domain/s3/dto/response/PresignedResponseDTO.java
similarity index 88%
rename from src/main/java/com/gam/api/external/s3/dto/response/PresignedResponseDTO.java
rename to src/main/java/com/gam/api/domain/s3/dto/response/PresignedResponseDTO.java
index 70cdbee7..6b64d09e 100644
--- a/src/main/java/com/gam/api/external/s3/dto/response/PresignedResponseDTO.java
+++ b/src/main/java/com/gam/api/domain/s3/dto/response/PresignedResponseDTO.java
@@ -1,4 +1,4 @@
-package com.gam.api.external.s3.dto.response;
+package com.gam.api.domain.s3.dto.response;
 
 import lombok.Builder;
 
diff --git a/src/main/java/com/gam/api/external/s3/service/S3Service.java b/src/main/java/com/gam/api/domain/s3/service/S3Service.java
similarity index 58%
rename from src/main/java/com/gam/api/external/s3/service/S3Service.java
rename to src/main/java/com/gam/api/domain/s3/service/S3Service.java
index 287c3926..37a6d51b 100644
--- a/src/main/java/com/gam/api/external/s3/service/S3Service.java
+++ b/src/main/java/com/gam/api/domain/s3/service/S3Service.java
@@ -1,7 +1,7 @@
-package com.gam.api.external.s3.service;
+package com.gam.api.domain.s3.service;
 
-import com.gam.api.external.s3.dto.request.PresignedRequestDTO;
-import com.gam.api.external.s3.dto.response.PresignedResponseDTO;
+import com.gam.api.domain.s3.dto.request.PresignedRequestDTO;
+import com.gam.api.domain.s3.dto.response.PresignedResponseDTO;
 import java.util.List;
 
 public interface S3Service {
diff --git a/src/main/java/com/gam/api/external/s3/service/S3ServiceImpl.java b/src/main/java/com/gam/api/domain/s3/service/S3ServiceImpl.java
similarity index 95%
rename from src/main/java/com/gam/api/external/s3/service/S3ServiceImpl.java
rename to src/main/java/com/gam/api/domain/s3/service/S3ServiceImpl.java
index 66c10e52..54170cc3 100644
--- a/src/main/java/com/gam/api/external/s3/service/S3ServiceImpl.java
+++ b/src/main/java/com/gam/api/domain/s3/service/S3ServiceImpl.java
@@ -1,10 +1,10 @@
-package com.gam.api.external.s3.service;
+package com.gam.api.domain.s3.service;
 
 import com.gam.api.common.exception.AwsException;
 import com.gam.api.common.message.*;
 import com.gam.api.config.S3Config;
-import com.gam.api.external.s3.dto.request.PresignedRequestDTO;
-import com.gam.api.external.s3.dto.response.PresignedResponseDTO;
+import com.gam.api.domain.s3.dto.request.PresignedRequestDTO;
+import com.gam.api.domain.s3.dto.response.PresignedResponseDTO;
 import lombok.RequiredArgsConstructor;
 import lombok.val;
 import org.springframework.http.HttpStatus;
diff --git a/src/main/java/com/gam/api/domain/user/dto/request/UserOnboardRequestDTO.java b/src/main/java/com/gam/api/domain/user/dto/request/UserOnboardRequestDTO.java
index 4be1ffdf..8abb5331 100644
--- a/src/main/java/com/gam/api/domain/user/dto/request/UserOnboardRequestDTO.java
+++ b/src/main/java/com/gam/api/domain/user/dto/request/UserOnboardRequestDTO.java
@@ -2,13 +2,13 @@
 
 import javax.validation.constraints.NotBlank;
 import javax.validation.constraints.NotEmpty;
+import javax.validation.constraints.Size;
 
 public record UserOnboardRequestDTO(
-        @NotBlank
-        @NotEmpty
+        @Size(min= 1, max= 15, message = "userName의 길이는 1글자 이상 15글자 이하여야 합니다.")
         String userName,
-        @NotBlank
-        @NotEmpty
+        @NotBlank(message = "info는 \"\"일 수 없습니다.")
+        @NotEmpty(message = "info는 null일 수 없습니다.")
         String info,
         @NotEmpty(message = "tags는 null일 수 없습니다, 하나 이상의 tag를 선택 해 주세요.")
         int[] tags
diff --git a/src/main/java/com/gam/api/domain/work/dto/request/WorkEditRequestDTO.java b/src/main/java/com/gam/api/domain/work/dto/request/WorkEditRequestDTO.java
index e2590ebc..e1375be2 100644
--- a/src/main/java/com/gam/api/domain/work/dto/request/WorkEditRequestDTO.java
+++ b/src/main/java/com/gam/api/domain/work/dto/request/WorkEditRequestDTO.java
@@ -6,9 +6,9 @@
 
 public record WorkEditRequestDTO(
         Long workId,
-        @NotBlank
+        @NotBlank(message = "작업물 이미지를 추가해주세요")
         String image,
-        @NotBlank
+        @NotBlank(message = "작업물 제목은 빈스트링 일 수 없습니다.")
         String title,
         String detail
 ) {
diff --git a/src/main/java/com/gam/api/domain/work/service/WorkServiceImpl.java b/src/main/java/com/gam/api/domain/work/service/WorkServiceImpl.java
index 5e6f32e8..8dc5c4fc 100644
--- a/src/main/java/com/gam/api/domain/work/service/WorkServiceImpl.java
+++ b/src/main/java/com/gam/api/domain/work/service/WorkServiceImpl.java
@@ -13,7 +13,7 @@
 import com.gam.api.domain.work.entity.Work;
 import com.gam.api.domain.user.repository.UserRepository;
 import com.gam.api.domain.work.repository.WorkRepository;
-import com.gam.api.external.s3.service.S3ServiceImpl;
+import com.gam.api.domain.s3.service.S3ServiceImpl;
 import lombok.RequiredArgsConstructor;
 import lombok.extern.slf4j.Slf4j;
 import lombok.val;