diff --git a/src/_pages/index/components/IntroSection.tsx b/src/_pages/index/components/IntroSection.tsx
index c469512f..5eb21108 100644
--- a/src/_pages/index/components/IntroSection.tsx
+++ b/src/_pages/index/components/IntroSection.tsx
@@ -17,12 +17,19 @@ export default function IntroSection() {
   const [isClient, setIsClient] = useState(false);
   const router = useRouter();
 
-  const targetDate = dayjs('2024-06-27 23:59:59').tz('Asia/Seoul').toDate(); // 8기 지원 마감일 (KST)
+  const applyDeadlineDate = dayjs('2024-06-27 23:59:59')
+    .tz('Asia/Seoul')
+    .toDate(); // 8기 지원 마감일 (KST)
+  const bigchatDeadlineDate = dayjs('2024-06-23 23:59:59')
+    .tz('Asia/Seoul')
+    .toDate(); // 퍼블릭 빅챗 마감일 (KST)
+
   const krCurrentDate = dayjs().tz('Asia/Seoul').toDate(); // 한국 시간 기준 현재 시간
 
-  const isClosed = krCurrentDate > targetDate;
+  const isApplyClosed = krCurrentDate > applyDeadlineDate;
+  const isBigchatClosed = krCurrentDate > bigchatDeadlineDate;
 
-  const [days, hours, minutes, seconds] = useCountdown(targetDate);
+  const [days, hours, minutes, seconds] = useCountdown(applyDeadlineDate);
 
   const handleApplyClick = () => {
     event({
@@ -34,6 +41,16 @@ export default function IntroSection() {
     router.push('/apply');
   };
 
+  const handleBigchatClick = () => {
+    event({
+      action: 'public-bigchat',
+      category: 'click',
+      label: '퍼블릭 빅챗 참여하기',
+      value: 1,
+    });
+    router.push('https://umoh.io/ausg-public-bigchat');
+  };
+
   useEffect(() => {
     setIsClient(true);
   }, []);
@@ -58,9 +75,11 @@ export default function IntroSection() {
             </h1>
             <div className="mt-[24px] hidden items-center gap-4 md:flex">
               <p className="text-[28px] font-bold text-white md:text-center md:text-[40px]">
-                {isClosed ? '8기 모집이 마감되었습니다.' : '☁️ 8기 모집중 ☁️'}
+                {isApplyClosed
+                  ? '8기 모집이 마감되었습니다.'
+                  : '☁️ 8기 모집중 ☁️'}
               </p>
-              {isClosed ? null : (
+              {isApplyClosed ? null : (
                 <button
                   type="button"
                   onClick={handleApplyClick}
@@ -70,13 +89,27 @@ export default function IntroSection() {
                 </button>
               )}
             </div>
-            {isClosed ? null : (
-              <div className="hidden items-center gap-4 md:flex">
+            {isApplyClosed ? null : (
+              <div className="hidden items-center gap-4 md:flex md:flex-col">
                 <p className="text-[18px] font-bold text-white md:text-[24px]">
                   {isClient
                     ? `🔥 지원 마감까지 ${days}일 ${hours}시간 ${minutes}분 ${seconds}초 🔥`
                     : null}
                 </p>
+                <div className="flex items-center gap-2">
+                  <p className="text-[18px] font-bold text-white md:text-[24px]">
+                    {isBigchatClosed ? null : 'AUSG이 궁금하다면?'}
+                  </p>
+                  {isBigchatClosed ? null : (
+                    <button
+                      type="button"
+                      onClick={handleBigchatClick}
+                      className="rounded-md bg-white px-6 py-2 text-[18px] font-bold text-primary duration-200 hover:bg-white/90"
+                    >
+                      퍼블릭 빅챗 참여하기
+                    </button>
+                  )}
+                </div>
               </div>
             )}
           </div>
@@ -89,22 +122,24 @@ export default function IntroSection() {
             className="right-0 animate-floating transition-[translate]"
           />
         </div>
-        <div className="mt-[24px] flex flex-col items-center justify-center gap-4 md:hidden">
-          <div className="flex gap-4">
-            <p className="text-[28px] font-bold text-white md:text-center md:text-[40px]">
-              {isClosed ? '8기 모집이 마감되었습니다.' : '☁️ 8기 모집중 ☁️'}
+        <div className="mt-[24px] flex flex-col flex-wrap items-center justify-center gap-4 md:hidden">
+          <div className="flex items-center gap-4">
+            <p className="text-[22px] font-bold text-white md:text-center md:text-[40px]">
+              {isApplyClosed
+                ? '8기 모집이 마감되었습니다.'
+                : '☁️ 8기 모집중 ☁️'}
             </p>
-            {isClosed ? null : (
+            {isApplyClosed ? null : (
               <button
                 type="button"
                 onClick={handleApplyClick}
-                className="rounded-md bg-white px-6 py-2 text-[18px] font-bold text-primary hover:bg-white/90"
+                className="shrink-0 rounded-md bg-white px-6 py-2 text-[18px] font-bold text-primary hover:bg-white/90"
               >
                 지원하기
               </button>
             )}
           </div>
-          {isClosed ? null : (
+          {isApplyClosed ? null : (
             <div className="flex items-center gap-4 md:hidden">
               <p className="text-[18px] font-bold text-white md:text-[24px]">
                 {isClient
@@ -113,6 +148,20 @@ export default function IntroSection() {
               </p>
             </div>
           )}
+          <div className="flex flex-col items-center gap-2">
+            <p className="text-[18px] font-bold text-white md:text-[24px]">
+              {isBigchatClosed ? null : 'AUSG이 궁금하다면?'}
+            </p>
+            {isBigchatClosed ? null : (
+              <button
+                type="button"
+                onClick={handleBigchatClick}
+                className="rounded-md bg-white px-6 py-2 text-[18px] font-bold text-primary duration-200 hover:bg-white/90"
+              >
+                퍼블릭 빅챗 참여하기
+              </button>
+            )}
+          </div>
         </div>
       </main>
     </div>