diff --git a/src/main/java/com/wooribound/api/individual/controller/WbUserNotificationController.java b/src/main/java/com/wooribound/api/individual/controller/WbUserNotificationController.java
index 0826522..c4a92d7 100644
--- a/src/main/java/com/wooribound/api/individual/controller/WbUserNotificationController.java
+++ b/src/main/java/com/wooribound/api/individual/controller/WbUserNotificationController.java
@@ -2,11 +2,16 @@
 
 import com.wooribound.domain.notification.dto.NotificationDTO;
 import com.wooribound.domain.notification.service.NotificationService;
+import io.swagger.v3.oas.annotations.Operation;
+import io.swagger.v3.oas.annotations.tags.Tag;
 import lombok.RequiredArgsConstructor;
+import org.springframework.http.ResponseEntity;
+import org.springframework.security.core.Authentication;
 import org.springframework.web.bind.annotation.*;
 
 import java.util.List;
 
+@Tag(name = "알림 메세지 API", description = "개인회원 서비스 중 알림 메세지 입니다.")
 @RestController
 @RequiredArgsConstructor
 @RequestMapping("/individual/notifications")
@@ -14,13 +19,16 @@ public class WbUserNotificationController {
 
     private final NotificationService notificationService;
 
+    @Operation(summary = "알림 메세지 전체 목록 조회", description = "알림 메세지 나눔 전체 목록 조회")
     @GetMapping
-    public List<NotificationDTO> getNotifications(@RequestParam String userId) {
-        return notificationService.getNotifications(userId);
+    public ResponseEntity getNotifications(Authentication authentication) {
+        return ResponseEntity.ok().body(notificationService.getNotifications(authentication));
     }
 
-    @GetMapping("/detail")
-    public String getNotificationDetail(@RequestParam long notiId) {
-        return notificationService.getNotificationDetail(notiId);
+    @Operation(summary = "알림 메세지 읽음 표시 업데이트", description = "알림 메세지 읽음 표시 업데이트")
+    @PutMapping("/read")
+    public ResponseEntity readNotification(Authentication authentication, @RequestParam(value = "notiId") Long notiId) {
+        return ResponseEntity.ok().body(notificationService.readNotification(authentication, notiId));
     }
+
 }
diff --git a/src/main/java/com/wooribound/domain/knowhow/service/WbUserKnowhowServiceImpl.java b/src/main/java/com/wooribound/domain/knowhow/service/WbUserKnowhowServiceImpl.java
index 69949bb..470493e 100644
--- a/src/main/java/com/wooribound/domain/knowhow/service/WbUserKnowhowServiceImpl.java
+++ b/src/main/java/com/wooribound/domain/knowhow/service/WbUserKnowhowServiceImpl.java
@@ -65,7 +65,7 @@ public Long createShareKnowhow(String userId, WbUserKnowhowDTO wbUserKnowhowDTO)
 
         Long knowhowId = 1L;
 
-        Optional<WbUser> byUserId = wbUserRepository.findByUserId(userId);
+        Optional<WbUser> byUserId = wbUserRepository.findById(userId);
         Optional<Long> maxKnowhowId = knowhowRepository.getMaxKnowhowId();
         if (maxKnowhowId.isPresent()) {
             knowhowId = maxKnowhowId.get() + 1;
diff --git a/src/main/java/com/wooribound/domain/notification/NotificationRepository.java b/src/main/java/com/wooribound/domain/notification/NotificationRepository.java
index b33de7e..7f6bf32 100644
--- a/src/main/java/com/wooribound/domain/notification/NotificationRepository.java
+++ b/src/main/java/com/wooribound/domain/notification/NotificationRepository.java
@@ -7,9 +7,8 @@
 import java.util.List;
 import java.util.Optional;
 
-public interface NotificationRepository extends JpaRepository<Notification, Integer> {
+public interface NotificationRepository extends JpaRepository<Notification, Long> {
     @Query("SELECT n FROM Notification n WHERE n.wbUser.userId = :userId")
     List<Notification> findByUserId(@Param("userId") String userId);
 
-    Optional<Notification> findByNotiId(long notiId);
 }
diff --git a/src/main/java/com/wooribound/domain/notification/dto/NotificationDTO.java b/src/main/java/com/wooribound/domain/notification/dto/NotificationDTO.java
index f4fe896..f2b0a8e 100644
--- a/src/main/java/com/wooribound/domain/notification/dto/NotificationDTO.java
+++ b/src/main/java/com/wooribound/domain/notification/dto/NotificationDTO.java
@@ -1,14 +1,18 @@
 package com.wooribound.domain.notification.dto;
 
 
+import com.wooribound.global.constant.YN;
 import lombok.*;
 
+import java.util.Date;
+
 @Builder
-@Getter
-@Setter
 @AllArgsConstructor
 @NoArgsConstructor
+@Data
 public class NotificationDTO {
-    private int notiId;
+    private Long notiId;
     private String notice;
+    private YN isConfirmed;
+    private Date createdAt;
 }
diff --git a/src/main/java/com/wooribound/domain/notification/service/NotificationService.java b/src/main/java/com/wooribound/domain/notification/service/NotificationService.java
index 1063adb..efd162d 100644
--- a/src/main/java/com/wooribound/domain/notification/service/NotificationService.java
+++ b/src/main/java/com/wooribound/domain/notification/service/NotificationService.java
@@ -1,11 +1,13 @@
 package com.wooribound.domain.notification.service;
 
 import com.wooribound.domain.notification.dto.NotificationDTO;
+import org.springframework.security.core.Authentication;
 
 import java.util.List;
 
 public interface NotificationService {
-    List<NotificationDTO> getNotifications(String userId);
+    List<NotificationDTO> getNotifications(Authentication authentication);
+
+    String readNotification (Authentication authentication, Long notiId);
 
-    String getNotificationDetail(long notiId);
 }
diff --git a/src/main/java/com/wooribound/domain/notification/service/NotificationServiceImpl.java b/src/main/java/com/wooribound/domain/notification/service/NotificationServiceImpl.java
index 34f02f7..70c5a44 100644
--- a/src/main/java/com/wooribound/domain/notification/service/NotificationServiceImpl.java
+++ b/src/main/java/com/wooribound/domain/notification/service/NotificationServiceImpl.java
@@ -4,39 +4,56 @@
 import com.wooribound.domain.notification.NotificationRepository;
 import com.wooribound.domain.notification.dto.NotificationDTO;
 import com.wooribound.global.constant.YN;
+import com.wooribound.global.exception.AuthenticationException;
+import com.wooribound.global.exception.NotEntityException;
+import com.wooribound.global.util.AuthenticateUtil;
 import lombok.RequiredArgsConstructor;
+import org.springframework.security.core.Authentication;
 import org.springframework.stereotype.Service;
 
 import java.util.List;
+import java.util.Optional;
 import java.util.stream.Collectors;
 
 @Service
 @RequiredArgsConstructor
 public class NotificationServiceImpl implements NotificationService {
 
+    private final AuthenticateUtil authenticateUtil;
     private final NotificationRepository notificationRepository;
 
     @Override
-    public List<NotificationDTO> getNotifications(String userId) {
-        // userId에 해당하는 모든 알림 조회 후 DTO로 변환
+    public List<NotificationDTO> getNotifications(Authentication authentication) {
+        String userId = authenticateUtil.CheckWbUserAuthAndGetUserId(authentication);
+
         return notificationRepository.findByUserId(userId).stream()
                 .map(notification -> NotificationDTO.builder()
-                        .notiId(Math.toIntExact(notification.getNotiId()))
+                        .notiId(notification.getNotiId())
                         .notice(notification.getNotice())
+                        .isConfirmed(notification.getIsConfirmed())
+                        .createdAt(notification.getCreatedAt())
                         .build())
                 .collect(Collectors.toList());
     }
 
     @Override
-    public String getNotificationDetail(long notiId) {
-        // 알림 상세 조회 및 is_confirmed를 Y로 변경
-        Notification notification = notificationRepository.findByNotiId(notiId)
-                .orElseThrow(() -> new IllegalArgumentException("Notification not found with id: " + notiId));
+    public String readNotification(Authentication authentication, Long notiId) {
+        String userId = authenticateUtil.CheckWbUserAuthAndGetUserId(authentication);
+        Optional<Notification> byIdNotification = notificationRepository.findById(notiId);
+
+        if (!byIdNotification.isPresent()) {
+            throw new NotEntityException();
+        }
 
-        // is_confirmed를 Y로 변경
+        if (!byIdNotification.get().getWbUser().getUserId().equals(userId)) {
+            throw new AuthenticationException();
+        }
+
+        Notification notification = byIdNotification.get();
         notification.setIsConfirmed(YN.Y);
         notificationRepository.save(notification);
 
-        return notification.getNotice();
+        return "Notification updated successfully";
     }
+
 }
\ No newline at end of file
diff --git a/src/main/java/com/wooribound/global/exception/NotEntityException.java b/src/main/java/com/wooribound/global/exception/NotEntityException.java
new file mode 100644
index 0000000..51e4b80
--- /dev/null
+++ b/src/main/java/com/wooribound/global/exception/NotEntityException.java
@@ -0,0 +1,5 @@
+package com.wooribound.global.exception;
+
+public class NotEntityException extends RuntimeException{
+    public NotEntityException() {super("존재하는 엔티티가 없습니다.");}
+}