diff --git a/mjsec-frontend/index.html b/mjsec-frontend/index.html
index e747084..5887cb2 100644
--- a/mjsec-frontend/index.html
+++ b/mjsec-frontend/index.html
@@ -20,14 +20,14 @@
     <meta property="og:type"        content="website" />
     <meta property="og:title"       content="MJSEC — Your Shield, Our Mission" />
     <meta property="og:description" content="명지대학교 정보보안 동아리 MJSEC 공식 사이트" />
-    <meta property="og:image"       content="./og-card.png" />   <!-- 1200×630 권장 -->
+    <meta property="og:image"       content="./og-card2.png" />   <!-- 1200×630 권장 -->
     <meta property="og:url"         content="https://mjsec.example.com" />
 
     <!-- 트위터 카드 (축약) -->
     <meta name="twitter:card"        content="summary_large_image" />
     <meta name="twitter:title"       content="MJSEC — Your Shield, Our Mission" />
     <meta name="twitter:description" content="명지대학교 정보보안 동아리 MJSEC 공식 사이트" />
-    <meta name="twitter:image"       content="./og-card.png" />
+    <meta name="twitter:image"       content="./og-card2.png" />
 
     <!-- ──── viewport & title ──── -->
     <meta name="viewport" content="width=device-width, initial-scale=1.0" />
diff --git a/mjsec-frontend/public/og-card.png b/mjsec-frontend/public/og-card.png
deleted file mode 100644
index 4c46903..0000000
Binary files a/mjsec-frontend/public/og-card.png and /dev/null differ
diff --git a/mjsec-frontend/public/og-card2.png b/mjsec-frontend/public/og-card2.png
new file mode 100644
index 0000000..0b3eee0
Binary files /dev/null and b/mjsec-frontend/public/og-card2.png differ
diff --git a/video1.gif b/video1.gif
deleted file mode 100644
index c5a347e..0000000
Binary files a/video1.gif and /dev/null differ