diff --git a/backend/app.py b/backend/app.py
index 9dd08ce..01354a1 100644
--- a/backend/app.py
+++ b/backend/app.py
@@ -500,7 +500,9 @@ def link_kakao_identity(user_id, kakao_id, kakao_data):
         WHERE provider = 'kakao' AND provider_user_id = ?
     """, (kakao_id,))
 
-    if not cursor.fetchone():
+    is_new_link = cursor.fetchone() is None
+
+    if is_new_link:
         # raw_data 제외 (세션 크기 절약)
         store_data = {k: v for k, v in kakao_data.items() if k != 'raw_data'}
         cursor.execute("""
@@ -517,6 +519,11 @@ def link_kakao_identity(user_id, kakao_id, kakao_data):
     if kakao_data.get('email'):
         updates.append("email = ?")
         params.append(kakao_data['email'])
+
+    # 카카오 인증일 기록 (최초 연동 시)
+    if is_new_link:
+        updates.append("kakao_verified_at = datetime('now')")
+
     if updates:
         params.append(user_id)
         cursor.execute(f"UPDATE users SET {', '.join(updates)} WHERE id = ?", params)
@@ -1840,7 +1847,7 @@ def admin():
 
     # 최근 가입 사용자 (20명)
     cursor.execute("""
-        SELECT id, nickname, phone, mileage_balance, created_at, updated_at
+        SELECT id, nickname, phone, mileage_balance, created_at, kakao_verified_at
         FROM users
         ORDER BY created_at DESC
         LIMIT 20
@@ -1852,7 +1859,7 @@ def admin():
     for user in recent_users_raw:
         user_dict = dict(user)
         user_dict['created_at'] = utc_to_kst_str(user['created_at'])
-        user_dict['updated_at'] = utc_to_kst_str(user['updated_at']) if user['updated_at'] else None
+        user_dict['kakao_verified_at'] = utc_to_kst_str(user['kakao_verified_at']) if user['kakao_verified_at'] else None
         recent_users.append(user_dict)
 
     # 최근 적립 내역 (50건)
diff --git a/backend/templates/admin.html b/backend/templates/admin.html
index 2673009..60aa84d 100644
--- a/backend/templates/admin.html
+++ b/backend/templates/admin.html
@@ -484,8 +484,8 @@
                             <td class="points-positive">{{ "{:,}".format(user.mileage_balance) }}P</td>
                             <td>{{ user.created_at[:16].replace('T', ' ') }}</td>
                             <td>
-                                {% if user.nickname != '고객' %}
-                                <span style="display: inline-flex; align-items: center; gap: 3px; background: #FEE500; color: #3C1E1E; font-size: 10px; font-weight: 700; padding: 3px 8px; border-radius: 10px;">💬 {{ user.updated_at[:10] if user.updated_at else '-' }}</span>
+                                {% if user.kakao_verified_at %}
+                                <span style="display: inline-flex; align-items: center; gap: 3px; background: #FEE500; color: #3C1E1E; font-size: 10px; font-weight: 700; padding: 3px 8px; border-radius: 10px;">💬 {{ user.kakao_verified_at[:10] }}</span>
                                 {% else %}
                                 <span style="display: inline-flex; align-items: center; background: #f1f3f5; color: #868e96; font-size: 10px; font-weight: 600; padding: 3px 8px; border-radius: 10px;">미인증</span>
                                 {% endif %}