diff --git a/build.gradle b/build.gradle
index 04b66f4..52848d1 100644
--- a/build.gradle
+++ b/build.gradle
@@ -59,6 +59,8 @@ dependencies {
 	annotationProcessor 'org.projectlombok:lombok'
 	testImplementation 'org.springframework.boot:spring-boot-starter-test'
 	testRuntimeOnly 'org.junit.platform:junit-platform-launcher'
+
+	implementation 'org.springframework.boot:spring-boot-starter-validation' // 유효성 검사 위해
 }
 
 tasks.named('test') {
diff --git a/src/main/java/sopt/univoice/domain/notice/controller/NoticeController.java b/src/main/java/sopt/univoice/domain/notice/controller/NoticeController.java
index 0e7a367..ad5d977 100644
--- a/src/main/java/sopt/univoice/domain/notice/controller/NoticeController.java
+++ b/src/main/java/sopt/univoice/domain/notice/controller/NoticeController.java
@@ -1,6 +1,7 @@
 package sopt.univoice.domain.notice.controller;
 
 
+import jakarta.validation.Valid;
 import lombok.RequiredArgsConstructor;
 import org.springframework.http.HttpStatus;
 import org.springframework.http.ResponseEntity;
@@ -20,7 +21,7 @@ public class NoticeController {
     private final NoticeService noticeService;
 
     @PostMapping("/create")
-    public ResponseEntity<SuccessStatusResponse<Void>> createPost(@ModelAttribute NoticeCreateRequest noticeCreateRequest) {
+    public ResponseEntity<SuccessStatusResponse<Void>> createPost(@Valid @ModelAttribute NoticeCreateRequest noticeCreateRequest) {
         System.out.println("createPost method called with request: " + noticeCreateRequest);
         noticeService.createPost(noticeCreateRequest);
         return ResponseEntity.status(HttpStatus.CREATED)
diff --git a/src/main/java/sopt/univoice/domain/notice/dto/NoticeCreateRequest.java b/src/main/java/sopt/univoice/domain/notice/dto/NoticeCreateRequest.java
index 64023d9..56e74aa 100644
--- a/src/main/java/sopt/univoice/domain/notice/dto/NoticeCreateRequest.java
+++ b/src/main/java/sopt/univoice/domain/notice/dto/NoticeCreateRequest.java
@@ -1,5 +1,6 @@
 package sopt.univoice.domain.notice.dto;
 
+import jakarta.validation.constraints.Size;
 import lombok.AllArgsConstructor;
 import lombok.*;
 import org.springframework.format.annotation.DateTimeFormat;
@@ -15,7 +16,7 @@
 //@AllArgsConstructor
 public class NoticeCreateRequest {
 
-
+    @Size(max = 100)
     private String title;
 
     private String content;
@@ -27,6 +28,6 @@ public class NoticeCreateRequest {
     @DateTimeFormat(iso = DateTimeFormat.ISO.DATE_TIME)
     private LocalDateTime endTime;
 
-    private List<MultipartFile> studentCardImages;
-
+    @Size(max = 5)
+    private List<MultipartFile> imageList;
 }
diff --git a/src/main/java/sopt/univoice/domain/notice/dto/NoticeDetailResponseDTO.java b/src/main/java/sopt/univoice/domain/notice/dto/NoticeDetailResponseDTO.java
index 9a2efd5..2ef938f 100644
--- a/src/main/java/sopt/univoice/domain/notice/dto/NoticeDetailResponseDTO.java
+++ b/src/main/java/sopt/univoice/domain/notice/dto/NoticeDetailResponseDTO.java
@@ -10,16 +10,13 @@
 @AllArgsConstructor
 public class NoticeDetailResponseDTO {
     private Long id;
+    private String writeAffiliation;
     private String title;
-    private String content;
-    private Long noticeLike;
-    private Long viewCount;
     private String target;
     private LocalDateTime startTime;
     private LocalDateTime endTime;
-    private String category;
-    private String contentSummary;
-    private Long memberId;
-    private String writeAffiliation;
+    private String content;
+    private LocalDateTime createdAt;
+    private Long viewCount;
     private List<String> noticeImages;
 }
diff --git a/src/main/java/sopt/univoice/domain/notice/dto/NoticeSaveDTO.java b/src/main/java/sopt/univoice/domain/notice/dto/NoticeSaveDTO.java
index 9a1f0fd..baaf94f 100644
--- a/src/main/java/sopt/univoice/domain/notice/dto/NoticeSaveDTO.java
+++ b/src/main/java/sopt/univoice/domain/notice/dto/NoticeSaveDTO.java
@@ -13,6 +13,6 @@ public class NoticeSaveDTO {
     private Long viewCount;
     private Long noticeLike;
     private String category;
-    private LocalDateTime startTime;
-    private LocalDateTime endTime;
+    private LocalDateTime createdAt;
+    private String image;
 }
diff --git a/src/main/java/sopt/univoice/domain/notice/entity/Notice.java b/src/main/java/sopt/univoice/domain/notice/entity/Notice.java
index 52d250c..6dbd535 100644
--- a/src/main/java/sopt/univoice/domain/notice/entity/Notice.java
+++ b/src/main/java/sopt/univoice/domain/notice/entity/Notice.java
@@ -30,8 +30,12 @@ public class Notice   extends BaseTimeEntity {
     private Long noticeLike = 0L;
 
     private Long viewCount = 0L;
+
+    private Long noticeSave = 0L;
+
     private String target;
 
+
     private LocalDateTime startTime;
     private LocalDateTime endTime;
 
@@ -71,6 +75,7 @@ public Notice(String title, String content, String target, LocalDateTime startTi
         this.member = member;
         this.noticeLike = 0L;
         this.viewCount = 0L;
+        this.noticeSave = 0L;
         this.contentSummary = contentSummary;
         this.category = category;
     }
@@ -89,6 +94,9 @@ public Long getViewCount() {
         return viewCount;
     }
 
+    public void setNoticeSave(Long noticeSave) {
+        this.noticeSave = noticeSave;
+    }
 
 
 }
diff --git a/src/main/java/sopt/univoice/domain/notice/entity/SaveNotice.java b/src/main/java/sopt/univoice/domain/notice/entity/SaveNotice.java
index b57b163..eb8e6f4 100644
--- a/src/main/java/sopt/univoice/domain/notice/entity/SaveNotice.java
+++ b/src/main/java/sopt/univoice/domain/notice/entity/SaveNotice.java
@@ -5,12 +5,13 @@
 import lombok.Getter;
 import lombok.NoArgsConstructor;
 import sopt.univoice.domain.user.entity.Member;
+import sopt.univoice.infra.persistence.BaseTimeEntity;
 
 
 @Entity
 @Getter
 @NoArgsConstructor
-public class SaveNotice {
+public class SaveNotice extends BaseTimeEntity {
     @Id
     @GeneratedValue(strategy = GenerationType.IDENTITY)
     private Long id;
diff --git a/src/main/java/sopt/univoice/domain/notice/repository/NoticeLikeRepository.java b/src/main/java/sopt/univoice/domain/notice/repository/NoticeLikeRepository.java
index 56e9160..38d9f56 100644
--- a/src/main/java/sopt/univoice/domain/notice/repository/NoticeLikeRepository.java
+++ b/src/main/java/sopt/univoice/domain/notice/repository/NoticeLikeRepository.java
@@ -9,4 +9,6 @@
 
 public interface NoticeLikeRepository extends JpaRepository<NoticeLike, Long> {
     Optional<NoticeLike> findByNoticeAndMember(Notice notice, Member member);
+
+    boolean existsByNoticeAndMember(Notice notice, Member member);
 }
diff --git a/src/main/java/sopt/univoice/domain/notice/repository/SaveNoticeRepository.java b/src/main/java/sopt/univoice/domain/notice/repository/SaveNoticeRepository.java
index df912fa..21f635b 100644
--- a/src/main/java/sopt/univoice/domain/notice/repository/SaveNoticeRepository.java
+++ b/src/main/java/sopt/univoice/domain/notice/repository/SaveNoticeRepository.java
@@ -12,6 +12,8 @@
 public interface SaveNoticeRepository extends JpaRepository<SaveNotice, Long>{
     Optional<SaveNotice> findByNoticeAndMember(Notice notice, Member member);
     List<SaveNotice> findByMember(Member member);
+
+    boolean existsByNoticeAndMember(Notice notice, Member member);
 }
 
 
diff --git a/src/main/java/sopt/univoice/domain/notice/service/NoticeService.java b/src/main/java/sopt/univoice/domain/notice/service/NoticeService.java
index de21ccf..a379c7e 100644
--- a/src/main/java/sopt/univoice/domain/notice/service/NoticeService.java
+++ b/src/main/java/sopt/univoice/domain/notice/service/NoticeService.java
@@ -13,12 +13,14 @@
 import sopt.univoice.domain.user.entity.Member;
 import sopt.univoice.domain.affiliation.entity.Role;
 import sopt.univoice.infra.common.exception.UnauthorizedException;
+import sopt.univoice.infra.common.exception.message.BusinessException;
 import sopt.univoice.infra.common.exception.message.ErrorMessage;
 import sopt.univoice.infra.external.OpenAiService;
 import sopt.univoice.infra.external.S3Service;
 
 import java.io.IOException;
 import java.util.ArrayList;
+import java.util.Comparator;
 import java.util.List;
 import java.util.stream.Collectors;
 
@@ -32,16 +34,16 @@ public class NoticeService {
     private final PrincipalHandler principalHandler;
     private final S3Service s3Service;
     private final OpenAiService openAiService;
+    private final NoticeViewRepository noticeViewRepository;
     private final NoticeLikeRepository noticeLikeRepository;
     private final SaveNoticeRepository saveNoticeRepository;
-    private final NoticeViewRepository noticeViewRepository;
 
     @Transactional
     public void createPost(NoticeCreateRequest noticeCreateRequest) {
         Long memberId = principalHandler.getUserIdFromPrincipal();
         System.out.println("Authenticated Member ID: " + memberId);
         Member member = authRepository.findById(memberId)
-                .orElseThrow(() -> new RuntimeException("회원이 존재하지 않습니다."));
+                            .orElseThrow(() -> new RuntimeException("회원이 존재하지 않습니다."));
         System.out.println("Member Role: " + member.getAffiliation().getRole());
 
         String summarizedContent = null;
@@ -61,27 +63,36 @@ public void createPost(NoticeCreateRequest noticeCreateRequest) {
 
         // Notice 엔티티 생성 및 저장
         Notice notice = Notice.builder()
-                .title(noticeCreateRequest.getTitle())
-                .content(noticeCreateRequest.getContent())
-                .target(noticeCreateRequest.getTarget())
-                .startTime(noticeCreateRequest.getStartTime())
-                .endTime(noticeCreateRequest.getEndTime())
-                .member(member)
-                .contentSummary(summarizedContent)
-                .category("공지사항")  // category 값을 '공지사항'으로 설정
-                .build();
+                            .title(noticeCreateRequest.getTitle())
+                            .content(noticeCreateRequest.getContent())
+                            .target(noticeCreateRequest.getTarget() != null ? noticeCreateRequest.getTarget() : "")
+                            .startTime(noticeCreateRequest.getStartTime() != null ? noticeCreateRequest.getStartTime() : null)
+                            .endTime(noticeCreateRequest.getEndTime() != null ? noticeCreateRequest.getEndTime() : null)
+                            .member(member)
+                            .contentSummary(summarizedContent)
+                            .category("공지사항")  // category 값을 '공지사항'으로 설정
+                            .build();
         noticeRepository.save(notice);
         System.out.println("Notice saved successfully with ID: " + notice.getId());
 
         // NoticeImage 엔티티 생성 및 저장
-        for (MultipartFile file : noticeCreateRequest.getStudentCardImages()) {
-            String fileName = storeFile(file); // 파일 저장 로직 필요
-            NoticeImage noticeImage = NoticeImage.builder()
-                    .notice(notice)
-                    .noticeImage(fileName)
-                    .build();
-            noticeImageRepository.save(noticeImage);
-            System.out.println("NoticeImage saved successfully with file name: " + fileName);
+        List<MultipartFile> files = noticeCreateRequest.getImageList();
+
+        if (files != null && !files.isEmpty()) {
+            for (MultipartFile file : files) {
+                try {
+                    String fileUrl = storeFile(file); // 파일 저장 로직 필요
+                    NoticeImage noticeImage = NoticeImage.builder()
+                                                  .notice(notice)
+                                                  .noticeImage(fileUrl)
+                                                  .build();
+                    noticeImageRepository.save(noticeImage);
+                    System.out.println("NoticeImage saved successfully with file URL: " + fileUrl);
+                } catch (Exception e) {
+                    System.err.println("Error saving NoticeImage: " + e.getMessage());
+                    e.printStackTrace();
+                }
+            }
         }
 
         // NoticeView 엔티티 생성 및 저장
@@ -90,24 +101,24 @@ public void createPost(NoticeCreateRequest noticeCreateRequest) {
 
         for (Member universityMember : universityMembers) {
             NoticeView noticeView = NoticeView.builder()
-                    .notice(notice)
-                    .member(universityMember)
-                    .readAt(false)
-                    .build();
+                                        .notice(notice)
+                                        .member(universityMember)
+                                        .readAt(false)
+                                        .build();
             noticeViewRepository.save(noticeView);
         }
-
     }
 
     private String storeFile(MultipartFile file) {
         try {
-            return s3Service.uploadImage("notice-images/", file);
+            String fileUrl = s3Service.uploadImage("notice-images/", file);
+            return fileUrl;
         } catch (IOException e) {
+            System.err.println("File upload failed: " + e.getMessage());
             throw new RuntimeException("파일 업로드에 실패했습니다.", e);
         }
     }
 
-
     @Transactional
     public void likeNotice(Long noticeId) {
         Long memberId = principalHandler.getUserIdFromPrincipal();
@@ -118,6 +129,12 @@ public void likeNotice(Long noticeId) {
         Notice notice = noticeRepository.findById(noticeId)
                 .orElseThrow(() -> new RuntimeException("공지사항이 존재하지 않습니다."));
 
+        // 이미 좋아요를 누른 것인지 확인
+        boolean alreadyLiked = noticeLikeRepository.existsByNoticeAndMember(notice, member);
+        if (alreadyLiked) {
+            throw new BusinessException(ErrorMessage.ALREADY_LIKED);
+        }
+
         // noticeLike를 1 증가시킵니다.
         notice.setNoticeLike(notice.getNoticeLike() + 1);
         noticeRepository.save(notice);
@@ -161,6 +178,16 @@ public void saveNotice(Long noticeId) {
         Notice notice = noticeRepository.findById(noticeId)
                 .orElseThrow(() -> new RuntimeException("공지사항이 존재하지 않습니다."));
 
+        // 이미 저장한 공지인지 확인하는 부분 추가
+        boolean alreadySaved = saveNoticeRepository.existsByNoticeAndMember(notice, member);
+        if (alreadySaved) {
+            throw new BusinessException(ErrorMessage.ALREADY_SAVED);
+        }
+
+        // noticeSave를 1 증가시킵니다.
+        notice.setNoticeSave(notice.getNoticeSave() + 1);
+        noticeRepository.save(notice);
+
         // SaveNotice 엔티티 생성 및 저장
         SaveNotice saveNotice = SaveNotice.builder()
                 .notice(notice)
@@ -179,9 +206,13 @@ public void saveCancleNotice(Long noticeId) {
         Notice notice = noticeRepository.findById(noticeId)
                 .orElseThrow(() -> new RuntimeException("공지사항이 존재하지 않습니다."));
 
+        // noticeSave를 1 감소시킵니다.
+        notice.setNoticeSave(notice.getNoticeSave() - 1);
+        noticeRepository.save(notice);
+
         // SaveNotice 엔티티 삭제
         SaveNotice saveNotice = saveNoticeRepository.findByNoticeAndMember(notice, member)
-                .orElseThrow(() -> new RuntimeException("저장된 공지사항이 존재하지 않습니다."));
+                                    .orElseThrow(() -> new RuntimeException("저장된 공지사항이 존재하지 않습니다."));
         saveNoticeRepository.delete(saveNotice);
     }
 
@@ -195,19 +226,21 @@ public List<NoticeSaveDTO> getSaveNoticeByUser() {
         List<SaveNotice> saveNotices = saveNoticeRepository.findByMember(member);
 
         return saveNotices.stream()
-                .map(saveNotice -> {
-                    Notice notice = saveNotice.getNotice();
-                    return new NoticeSaveDTO(
-                            notice.getId(),
-                            notice.getTitle(),
-                            notice.getViewCount(),
-                            notice.getNoticeLike(),
-                            notice.getCategory(),
-                            notice.getStartTime(),
-                            notice.getEndTime()
-                    );
-                })
-                .collect(Collectors.toList());
+                   .map(saveNotice -> {
+                       Notice notice = saveNotice.getNotice();
+                       String image = notice.getNoticeImages().isEmpty() ? null : notice.getNoticeImages().get(0).getNoticeImage();
+                       return new NoticeSaveDTO(
+                           notice.getId(),
+                           notice.getTitle(),
+                           notice.getViewCount(),
+                           notice.getNoticeLike(),
+                           notice.getCategory(),
+                           notice.getCreatedAt(),
+                           image
+                       );
+                   })
+                   .sorted(Comparator.comparing(NoticeSaveDTO::getCreatedAt))
+                   .collect(Collectors.toList());
     }
 
     @Transactional
@@ -463,17 +496,14 @@ public NoticeDetailResponseDTO getNoticeById(Long noticeId) {
 
         return new NoticeDetailResponseDTO(
                 notice.getId(),
+                writeAffiliation,
                 notice.getTitle(),
-                notice.getContent(),
-                notice.getNoticeLike(),
-                notice.getViewCount(),
                 notice.getTarget(),
                 notice.getStartTime(),
                 notice.getEndTime(),
-                notice.getCategory(),
-                notice.getContentSummary(),
-                notice.getMember().getId(),
-                writeAffiliation, // 추가된 부분
+                notice.getContent(),
+                notice.getCreatedAt(),
+                notice.getViewCount(),
                 notice.getNoticeImages().stream().map(NoticeImage::getNoticeImage).collect(Collectors.toList())
         );
     }
diff --git a/src/main/java/sopt/univoice/infra/common/exception/ValidationExceptionHandler.java b/src/main/java/sopt/univoice/infra/common/exception/ValidationExceptionHandler.java
new file mode 100644
index 0000000..f8c1c2a
--- /dev/null
+++ b/src/main/java/sopt/univoice/infra/common/exception/ValidationExceptionHandler.java
@@ -0,0 +1,24 @@
+package sopt.univoice.infra.common.exception;
+
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.MethodArgumentNotValidException;
+import org.springframework.web.bind.annotation.ExceptionHandler;
+import org.springframework.web.bind.annotation.RestControllerAdvice;
+
+import java.util.HashMap;
+import java.util.Map;
+
+@RestControllerAdvice
+public class ValidationExceptionHandler {
+
+    @ExceptionHandler(MethodArgumentNotValidException.class)
+    public ResponseEntity<Map<String, String>> handleValidationExceptions(MethodArgumentNotValidException ex) {
+        Map<String, String> errors = new HashMap<>();
+        ex.getBindingResult().getFieldErrors().forEach(error ->
+                                                           errors.put(error.getField(), error.getDefaultMessage())
+        );
+        return new ResponseEntity<>(errors, HttpStatus.BAD_REQUEST);
+    }
+}
+
diff --git a/src/main/java/sopt/univoice/infra/common/exception/message/ErrorMessage.java b/src/main/java/sopt/univoice/infra/common/exception/message/ErrorMessage.java
index c3bea00..d9581d2 100644
--- a/src/main/java/sopt/univoice/infra/common/exception/message/ErrorMessage.java
+++ b/src/main/java/sopt/univoice/infra/common/exception/message/ErrorMessage.java
@@ -12,6 +12,8 @@ public enum ErrorMessage {
     EMAIL_DUPLICATE(HttpStatus.NO_CONTENT.value(), "이미 사용중인 이메일 입니다."),
     JWT_UNAUTHORIZED_EXCEPTION(HttpStatus.UNAUTHORIZED.value(), "사용자의 로그인 검증을 실패했습니다."),
     APPROVEADMIN_UNAUTHORIZED_EXCEPTION(HttpStatus.UNAUTHORIZED.value(), "승인된 관리자의 로그인 검증을 실패했습니다."),
+    ALREADY_SAVED(HttpStatus.CONFLICT.value(), "이미 저장한 공지입니다."),
+    ALREADY_LIKED(HttpStatus.CONFLICT.value(), "이미 좋아요한 공지입니다."),
     ;
     private final int status;
     private final String message;
diff --git a/src/main/java/sopt/univoice/infra/external/S3Service.java b/src/main/java/sopt/univoice/infra/external/S3Service.java
index 6852aea..4741d45 100644
--- a/src/main/java/sopt/univoice/infra/external/S3Service.java
+++ b/src/main/java/sopt/univoice/infra/external/S3Service.java
@@ -20,15 +20,17 @@ public class S3Service {
 
     private final String bucketName;
     private final AwsConfig awsConfig;
+    private final String region;
     private static final List<String> IMAGE_EXTENSIONS = Arrays.asList("image/jpeg", "image/png", "image/jpg", "image/webp");
 
-
-    public S3Service(@Value("${aws-property.s3-bucket-name}") final String bucketName, AwsConfig awsConfig) {
+    public S3Service(@Value("${aws-property.s3-bucket-name}") final String bucketName,
+                     AwsConfig awsConfig,
+                     @Value("${aws-property.aws-region}") final String region) {
         this.bucketName = bucketName;
         this.awsConfig = awsConfig;
+        this.region = region;
     }
 
-
     public String uploadImage(String directoryPath, MultipartFile image) throws IOException {
         final String key = directoryPath + generateImageFileName();
         final S3Client s3Client = awsConfig.getS3Client();
@@ -37,33 +39,33 @@ public String uploadImage(String directoryPath, MultipartFile image) throws IOEx
         validateFileSize(image);
 
         PutObjectRequest request = PutObjectRequest.builder()
-                .bucket(bucketName)
-                .key(key)
-                .contentType(image.getContentType())
-                .contentDisposition("inline")
-                .build();
+                                       .bucket(bucketName)
+                                       .key(key)
+                                       .contentType(image.getContentType())
+                                       .contentDisposition("inline")
+                                       .build();
 
         RequestBody requestBody = RequestBody.fromBytes(image.getBytes());
         s3Client.putObject(request, requestBody);
-        return key;
+
+        // Return the URL of the uploaded image
+        return String.format("https://%s.s3.%s.amazonaws.com/%s", bucketName, region, key);
     }
 
     public void deleteImage(String key) throws IOException {
         final S3Client s3Client = awsConfig.getS3Client();
 
         s3Client.deleteObject((DeleteObjectRequest.Builder builder) ->
-                builder.bucket(bucketName)
-                        .key(key)
-                        .build()
+                                  builder.bucket(bucketName)
+                                      .key(key)
+                                      .build()
         );
     }
 
-
     private String generateImageFileName() {
         return UUID.randomUUID() + ".jpg";
     }
 
-
     private void validateExtension(MultipartFile image) {
         String contentType = image.getContentType();
         if (!IMAGE_EXTENSIONS.contains(contentType)) {
@@ -78,6 +80,4 @@ private void validateFileSize(MultipartFile image) {
             throw new RuntimeException("이미지 사이즈는 5MB를 넘을 수 없습니다.");
         }
     }
-
-}
-
+}
\ No newline at end of file