diff --git a/src/main/java/com/umc/naoman/domain/shareGroup/service/ShareGroupServiceImpl.java b/src/main/java/com/umc/naoman/domain/shareGroup/service/ShareGroupServiceImpl.java
index 512fe9c..97ba559 100644
--- a/src/main/java/com/umc/naoman/domain/shareGroup/service/ShareGroupServiceImpl.java
+++ b/src/main/java/com/umc/naoman/domain/shareGroup/service/ShareGroupServiceImpl.java
@@ -85,6 +85,11 @@ public ShareGroup joinShareGroup(Long shareGroupId, Long profileId, Member membe
             throw new BusinessException(ShareGroupErrorCode.INVALID_PROFILE_FOR_GROUP);
         }
 
+        //공유그룹에 해당 profile로 참여한 회원이 이미 있으면
+        if (profile.getMember() != null) {
+            throw new BusinessException(ShareGroupErrorCode.MEMBER_ALREADY_EXIST);
+        }
+
         //해당 멤버(본인)을 선택한 profile에 세팅, 저장
         profile.setInfo(member);
         profileRepository.save(profile);
diff --git a/src/main/java/com/umc/naoman/global/error/code/ShareGroupErrorCode.java b/src/main/java/com/umc/naoman/global/error/code/ShareGroupErrorCode.java
index 3ea7d8b..1b900aa 100644
--- a/src/main/java/com/umc/naoman/global/error/code/ShareGroupErrorCode.java
+++ b/src/main/java/com/umc/naoman/global/error/code/ShareGroupErrorCode.java
@@ -18,7 +18,8 @@ public enum ShareGroupErrorCode implements ErrorCode {
     INVALID_PROFILE_FOR_GROUP(400, "EG007", "해당 프로필은 이 공유 그룹에 속하지 않습니다."),
 
     UNAUTHORIZED_DELETE(403, "EG008", "공유 그룹을 삭제할 권한이 없습니다."),
-    ALREADY_JOINED(400, "EG009", "이미 해당 공유 그룹에 참여하였습니다.");
+    ALREADY_JOINED(400, "EG009", "이미 해당 공유 그룹에 참여하였습니다."),
+    MEMBER_ALREADY_EXIST(400, "EG010", "이미 해당 프로필로 공유 그룹에 참여한 멤버가 존재합니다.")
     ;
 
     private final int status;
diff --git a/src/main/java/com/umc/naoman/global/security/util/CookieUtils.java b/src/main/java/com/umc/naoman/global/security/util/CookieUtils.java
index 3706657..6ebd156 100644
--- a/src/main/java/com/umc/naoman/global/security/util/CookieUtils.java
+++ b/src/main/java/com/umc/naoman/global/security/util/CookieUtils.java
@@ -12,15 +12,16 @@
 import java.util.Base64;
 
 public class CookieUtils {
-    private static final String COOKIE_DOMAIN = ".naoman.site";
+//    private static final String COOKIE_DOMAIN = ".naoman.site";
+    private static final String COOKIE_DOMAIN = "localhost";
     public static void addCookie(HttpServletResponse response, String name, String value, int maxAge) {
         ResponseCookie cookie = ResponseCookie.from(name, value)
                 .path("/")
                 .domain(COOKIE_DOMAIN)
                 .maxAge(maxAge)
                 .httpOnly(false)
-                .secure(true)
-                .sameSite("None")
+//                .secure(true)
+//                .sameSite("None")
                 .build();
 
         response.addHeader(HttpHeaders.SET_COOKIE, cookie.toString());