diff --git a/.env b/.env
index c6ee8ff..78761e5 100644
--- a/.env
+++ b/.env
@@ -1,3 +1,3 @@
-VITE_API_URL=http://localhost:8080
-VITE_GOOGLE_REDIRECT_URI=http://localhost:8080/api/v1/auth/google
+VITE_API_URL=https://api.eventee.cloud
+VITE_GOOGLE_REDIRECT_URI=https://api.eventee.cloud/api/v1/auth/google
 VITE_GOOGLE_CLIENT_ID=1311838165-j2g0s0tnb4hr1ptsksurpultd8uk14ov.apps.googleusercontent.com
diff --git a/.env.development b/.env.development
index 78761e5..c6ee8ff 100644
--- a/.env.development
+++ b/.env.development
@@ -1,3 +1,3 @@
-VITE_API_URL=https://api.eventee.cloud
-VITE_GOOGLE_REDIRECT_URI=https://api.eventee.cloud/api/v1/auth/google
+VITE_API_URL=http://localhost:8080
+VITE_GOOGLE_REDIRECT_URI=http://localhost:8080/api/v1/auth/google
 VITE_GOOGLE_CLIENT_ID=1311838165-j2g0s0tnb4hr1ptsksurpultd8uk14ov.apps.googleusercontent.com
diff --git a/src/pages/AdminDashboard.tsx b/src/pages/AdminDashboard.tsx
index 722cc0b..8285434 100644
--- a/src/pages/AdminDashboard.tsx
+++ b/src/pages/AdminDashboard.tsx
@@ -480,9 +480,6 @@ function GroupManagement({
   );
 }
 
-/* ----------------------------------------------------
-    Notice Write Tab (관리자 공지 작성)
----------------------------------------------------- */
 function NoticeWriteTab({ groups, event }) {
   const [postType, setPostType] = useState<"TEXT" | "VOTE">("TEXT");
   const [content, setContent] = useState("");
@@ -492,14 +489,20 @@ function NoticeWriteTab({ groups, event }) {
   const [selectedGroups, setSelectedGroups] = useState<number[]>([]);
   const API_URL = import.meta.env.VITE_API_URL;
 
-  const toggleGroup = (groupNo: number) => {
+  /* -----------------------------------
+        그룹 선택 토글 (groupId 기반)
+  ----------------------------------- */
+  const toggleGroup = (groupId: number) => {
     setSelectedGroups((prev) =>
-      prev.includes(groupNo)
-        ? prev.filter((id) => id !== groupNo)
-        : [...prev, groupNo]
+      prev.includes(groupId)
+        ? prev.filter((id) => id !== groupId)
+        : [...prev, groupId]
     );
   };
 
+  /* -----------------------------------
+        공지 등록
+  ----------------------------------- */
   const handleSubmit = async () => {
     if (!content.trim()) return alert("내용을 입력하세요.");
     if (selectedGroups.length === 0) return alert("공지 배포 그룹을 선택하세요.");
@@ -512,6 +515,8 @@ function NoticeWriteTab({ groups, event }) {
         postType === "VOTE"
           ? [voteOption1, voteOption2].filter(Boolean).join("_")
           : null,
+
+      // ⭐ groupId 기준으로 전달
       groupNums: selectedGroups.join("_"),
     };
 
@@ -525,6 +530,8 @@ function NoticeWriteTab({ groups, event }) {
       if (!data.isSuccess) return alert("공지 등록 실패");
 
       alert("공지 등록 완료!");
+
+      // reset
       setContent("");
       setVoteTitle("");
       setVoteOption1("");
@@ -537,6 +544,9 @@ function NoticeWriteTab({ groups, event }) {
     }
   };
 
+  /* -----------------------------------
+        JSX
+  ----------------------------------- */
   return (
     <Card className="p-6 bg-white rounded-xl border border-[#E8E4D9] shadow-sm">
       <CardTitle className="text-[#67594C] text-xl mb-4">공지 작성</CardTitle>
@@ -615,9 +625,9 @@ function NoticeWriteTab({ groups, event }) {
           {groups.map((g) => (
             <button
               key={g.groupId}
-              onClick={() => toggleGroup(g.groupNo)}
+              onClick={() => toggleGroup(g.groupId)}   // ⭐ groupId 사용
               className={`border rounded-lg p-3 text-left ${
-                selectedGroups.includes(g.groupNo)
+                selectedGroups.includes(g.groupId)        // ⭐ groupId 기반 선택
                   ? "bg-[#67594C] text-white border-[#67594C]"
                   : "bg-white border-gray-300 text-gray-800"
               }`}
@@ -629,7 +639,7 @@ function NoticeWriteTab({ groups, event }) {
         </div>
       </div>
 
-      {/* 등록 */}
+      {/* 등록 버튼 */}
       <div className="flex justify-end">
         <Button
           onClick={handleSubmit}
@@ -642,6 +652,7 @@ function NoticeWriteTab({ groups, event }) {
   );
 }
 
+
 /* ----------------------------------------------------
     Edit Event Modal
 ---------------------------------------------------- */
diff --git a/src/pages/EventMainPage.tsx b/src/pages/EventMainPage.tsx
index 8b5a0f7..14892f5 100644
--- a/src/pages/EventMainPage.tsx
+++ b/src/pages/EventMainPage.tsx
@@ -254,6 +254,11 @@ const uploadToS3 = async (presignedUrl: string, file: File) => {
         nickname,
       });
 
+      if (nickname) {
+        localStorage.setItem("eventNickname", nickname);
+      }
+
+
       const convertedTeams: Team[] = (groups ?? []).map((g: any) => ({
         id: String(g.groupId),
         name: g.groupName,
@@ -267,6 +272,8 @@ const uploadToS3 = async (presignedUrl: string, file: File) => {
         img: g.groupImg,
       }));
 
+      convertedTeams.sort((a, b) => Number(a.groupNo) - Number(b.groupNo));
+
       setTeams(convertedTeams);
 
       const teamsWithPosts = await Promise.all(
@@ -276,6 +283,8 @@ const uploadToS3 = async (presignedUrl: string, file: File) => {
         })
       );
 
+      teamsWithPosts.sort((a, b) => Number(a.groupNo) - Number(b.groupNo));
+
       setTeams(teamsWithPosts);
     } catch (err) {
       console.error("이벤트 그룹 API 오류:", err);
@@ -439,43 +448,41 @@ const handleSubmitGroupEdit = async () => {
   };
 
   const fetchGroupPosts = async (groupId: string): Promise<Post[]> => {
-    try {
-      const res = await apiFetch(
-        `${API_URL}/api/v1/events/${eventId}/groups/${groupId}/posts`,
-        {
-          method: "GET",
-        }
-      );
-
-      const data = await res.json();
+  try {
+    const res = await apiFetch(
+      `${API_URL}/api/v1/events/${eventId}/groups/${groupId}/posts`,
+      {
+        method: "GET",
+      }
+    );
 
-      console.log("posts raw data:", data.result);
+    const data = await res.json();
+    if (!data.isSuccess) return [];
 
-      if (!data.isSuccess) return [];
+    let rawPosts: any[] = [];
 
-      let rawPosts: any[] = [];
+    if (Array.isArray(data.result?.posts)) {
+      rawPosts = data.result.posts;
+    } else if (Array.isArray(data.result)) {
+      rawPosts = data.result;
+    } else if (data.result?.postId) {
+      rawPosts = [data.result];
+    }
 
-      // CASE 1: { posts: [...] }
-      if (Array.isArray(data.result?.posts)) {
-        rawPosts = data.result.posts;
-      }
-      // CASE 2: result 자체가 배열
-      else if (Array.isArray(data.result)) {
-        rawPosts = data.result;
-      }
-      // CASE 3: 단일 객체
-      else if (data.result?.postId) {
-        rawPosts = [data.result];
-      }
+    return rawPosts
+      .map((post: any) => convertPost(post))
+      .sort((a, b) => {
+        const da = a.createdAt ? new Date(a.createdAt).getTime() : 0;
+        const db = b.createdAt ? new Date(b.createdAt).getTime() : 0;
+        return da - db;
+      });
 
-      console.log("rawPosts:", rawPosts);
+  } catch (err) {
+    console.error("그룹 게시글 API 오류:", err);
+    return [];
+  }
+};
 
-      return rawPosts.map((post: any) => convertPost(post));
-    } catch (err) {
-      console.error("그룹 게시글 API 오류:", err);
-      return [];
-    }
-  };
 
   // 게시글 생성 / 수정
   const resetPostForm = () => {
@@ -693,7 +700,14 @@ const handleSubmitGroupEdit = async () => {
   const isEventHost =
     (eventInfo?.role ?? user?.role)?.toUpperCase() === "HOST";
 
-  const displayNickname = location.state?.nickname ?? eventInfo?.nickname ?? "닉네임";
+  const cachedNickname = localStorage.getItem("eventNickname");
+
+  const displayNickname =
+      cachedNickname ??
+      eventInfo?.nickname ??
+      location.state?.nickname ??
+      "닉네임";
+
 
 
 useEffect(() => {
@@ -711,11 +725,14 @@ useEffect(() => {
         return {
           ...g,
           groupId: String(g.groupId),
+          groupNo: Number(g.groupNo ?? g.groupNum ?? g.groupId), 
           posts,
         };
       })
     );
 
+    newTeamsWithPosts.sort((a, b) => Number(a.groupNo) - Number(b.groupNo));
+
     setTeams((prev) => {
       let changed = false;
 
@@ -723,9 +740,8 @@ useEffect(() => {
         const newTeam = newTeamsWithPosts.find(
           (t) => String(t.groupId) === String(oldTeam.id)
         );
-        if (!newTeam) return oldTeam; // 혹시 없는 경우 그대로
+        if (!newTeam) return oldTeam;
 
-        // 변경 여부 체크
         const oldPosts = JSON.stringify(oldTeam.posts);
         const newPosts = JSON.stringify(newTeam.posts);
 
@@ -734,28 +750,21 @@ useEffect(() => {
           return {
             ...oldTeam,
             posts: newTeam.posts,
-            // 필요한 경우 description, img, leader도 업데이트 가능
           };
         }
 
         return oldTeam;
       });
 
-      if (changed) {
-        console.log("변경 감지 → 업데이트 실행");
-        return updated;
-      }
+      updated.sort((a, b) => Number(a.groupNo) - Number(b.groupNo));
 
-      console.log("변화 없음 → UI 재렌더 생략");
-      return prev;
+      return changed ? updated : prev;
     });
   }, 10000);
 
   return () => clearInterval(interval);
 }, [eventId]);
 
-
-
   return (
     <div className="h-screen flex flex-col overflow-hidden">
       {/* 헤더 */}