diff --git a/public/icons/logo.png b/public/icons/logo.png
new file mode 100644
index 00000000..34649118
Binary files /dev/null and b/public/icons/logo.png differ
diff --git a/src/app/icon.png b/src/app/icon.png
new file mode 100644
index 00000000..34649118
Binary files /dev/null and b/src/app/icon.png differ
diff --git a/src/app/layout.tsx b/src/app/layout.tsx
index cfbb2e30..f7c534d8 100644
--- a/src/app/layout.tsx
+++ b/src/app/layout.tsx
@@ -11,9 +11,9 @@ const myFont = localFont({
   src: "../shared/fonts/PretendardVariable.woff2",
 });
 
-export const metadata: Metadata = {
-  title: "Create Next App",
-  description: "Generated by create next app",
+export const metadata = {
+  title: "찰딱",
+  description: "중고거래 플랫폼 찰딱",
 };
 
 export default function RootLayout({
diff --git a/src/entities/post/model/constants/api.ts b/src/entities/post/model/constants/api.ts
index fb28a634..b7b7e958 100644
--- a/src/entities/post/model/constants/api.ts
+++ b/src/entities/post/model/constants/api.ts
@@ -1 +1 @@
-export const POST_PAGE_SIZE = 10;
+export const POST_PAGE_SIZE = 12;
diff --git a/src/entities/post/ui/list/PostList.tsx b/src/entities/post/ui/list/PostList.tsx
index efa20f37..e97fc45d 100644
--- a/src/entities/post/ui/list/PostList.tsx
+++ b/src/entities/post/ui/list/PostList.tsx
@@ -70,20 +70,24 @@ export default function PostList({
         />
       </div>
 
-      <div className="grid grid-cols-2 gap-[15px] xl:grid-cols-3">
-        {posts.map((post, i) =>
-          i === posts.length - 1 ? (
-            <div ref={lastRef} key={post.postingId}>
-              <PostCard {...post} />
-            </div>
-          ) : (
-            <PostCard key={post.postingId} {...post} />
-          ),
-        )}
-      </div>
-
-      {isFetchingNextPage && (
-        <p className="mt-4 text-center text-gray-400">불러오는 중...</p>
+      {posts.length === 0 && !isFetchingNextPage ? (
+        <div className="flex flex-col items-center justify-center py-20 text-gray-400">
+          <span className="text-[16px]">
+            해당 카테고리에 등록된 게시물이 없어요.
+          </span>
+        </div>
+      ) : (
+        <div className="grid grid-cols-2 gap-[15px] xl:grid-cols-3">
+          {posts.map((post, i) =>
+            i === posts.length - 1 ? (
+              <div ref={lastRef} key={post.postingId}>
+                <PostCard {...post} />
+              </div>
+            ) : (
+              <PostCard key={post.postingId} {...post} />
+            ),
+          )}
+        </div>
       )}
     </section>
   );
diff --git a/src/entities/user/ui/card/Profile.tsx b/src/entities/user/ui/card/Profile.tsx
index 26b7ecaf..046b1ca7 100644
--- a/src/entities/user/ui/card/Profile.tsx
+++ b/src/entities/user/ui/card/Profile.tsx
@@ -32,6 +32,32 @@ const Profile = ({
   const { logout } = useAuthStore();
   const { openModal, closeModal } = useModalStore();
 
+  const handleLogout = async () => {
+    const res = await fetch("/api/auth/logout", {
+      method: "POST",
+      credentials: "include",
+    });
+
+    if (res.ok) {
+      router.push("/login");
+      router.refresh();
+      logout();
+      openModal("normal", {
+        message: "로그아웃이 완료되었습니다.",
+        onClick: () => {
+          closeModal();
+        },
+      });
+    } else {
+      openModal("normal", {
+        message: "로그아웃에 실패했습니다.",
+        onClick: () => {
+          closeModal();
+        },
+      });
+    }
+  };
+
   return (
     <article className="flex h-[556px] w-[335px] shrink-0 items-center justify-center rounded-lg border border-[#353542] bg-[#252530] px-5 py-7 md:h-[601px] md:w-[509px] md:px-7 xl:h-[753px] xl:w-[340px] xl:px-5 xl:pt-10">
       <div className="flex h-full w-full flex-col items-center justify-between">
@@ -75,7 +101,9 @@ const Profile = ({
         </div>
 
         <div className="w-full text-center">
-          <dd className="text-lg font-semibold text-[#F1F1F5]">{category}</dd>
+          <dd className="text-lg font-semibold text-[#F1F1F5]">
+            {category || "—"}
+          </dd>
           <dt className="mt-1 text-sm text-[#9FA6B2]">관심 카테고리</dt>
         </div>
 
@@ -87,30 +115,12 @@ const Profile = ({
           <Button
             variant="tertiary"
             className="w-full!"
-            onClick={async () => {
-              const res = await fetch("/api/auth/logout", {
-                method: "POST",
-                credentials: "include",
+            onClick={() => {
+              openModal("confirm", {
+                message: "정말 로그아웃하시겠습니까?",
+                onConfirm: handleLogout,
+                onCancel: closeModal,
               });
-
-              if (res.ok) {
-                openModal("normal", {
-                  message: "로그아웃이 완료되었습니다.",
-                  onClick: () => {
-                    closeModal();
-                    logout();
-                    router.push("/login");
-                    router.refresh();
-                  },
-                });
-              } else {
-                openModal("normal", {
-                  message: "로그아웃에 실패했습니다.",
-                  onClick: () => {
-                    closeModal();
-                  },
-                });
-              }
             }}
           >
             로그아웃
diff --git a/src/features/auth/ui/LoginForm/LoginForm.tsx b/src/features/auth/ui/LoginForm/LoginForm.tsx
index e9e71320..925e5bd5 100644
--- a/src/features/auth/ui/LoginForm/LoginForm.tsx
+++ b/src/features/auth/ui/LoginForm/LoginForm.tsx
@@ -36,9 +36,8 @@ export const LoginForm = ({ onSuccess, onError }: LoginFormProps) => {
       setAccessToken(res.accessToken);
       onSuccess?.();
     } catch (error) {
-      onError?.("로그인에 실패하였습니다.\n이메일과 비밀번호를 확인해주세요.");
-    } finally {
       setIsLoading(false);
+      onError?.("로그인에 실패하였습니다.\n이메일과 비밀번호를 확인해주세요.");
     }
   };
 
diff --git a/src/widgets/header/ui/HeaderDesktop.tsx b/src/widgets/header/ui/HeaderDesktop.tsx
index 77fb9964..7eaea990 100644
--- a/src/widgets/header/ui/HeaderDesktop.tsx
+++ b/src/widgets/header/ui/HeaderDesktop.tsx
@@ -33,7 +33,9 @@ const HeaderDesktop = ({
   return (
     <div className="hidden w-full items-center justify-between md:flex">
       <div className="text-white">
-        <Link href="/">찰딱</Link>
+        <Link href="/">
+          <img src="/icons/logo.png" className="h-15 w-15" />
+        </Link>
       </div>
 
       <div className="flex items-center">
diff --git a/src/widgets/header/ui/HeaderMobile.tsx b/src/widgets/header/ui/HeaderMobile.tsx
index 168e6428..ff176c86 100644
--- a/src/widgets/header/ui/HeaderMobile.tsx
+++ b/src/widgets/header/ui/HeaderMobile.tsx
@@ -9,24 +9,24 @@ interface HeaderMobileProps {
 
 const HeaderMobile = ({ setShowSearch, onOpenMenu }: HeaderMobileProps) => {
   return (
-    <div className="flex w-full items-center justify-between md:hidden">
+    <div className="relative flex w-full items-center justify-between md:hidden">
       <button
         aria-label="menu"
         type="button"
-        className="cursor-pointer"
+        className="z-10 cursor-pointer"
         onClick={onOpenMenu}
       >
         <img src="/icons/menu.svg" alt="menu" className="h-[24px] w-[24px]" />
       </button>
 
-      <div className="flex-1 text-center text-white">
-        <Link href="/">찰딱</Link>
-      </div>
+      <Link href="/" className="absolute left-1/2 -translate-x-1/2 text-white">
+        <img src="/icons/logo.png" className="h-10 w-10" />
+      </Link>
 
       <button
         aria-label="search-button"
         type="button"
-        className="cursor-pointer"
+        className="z-10 cursor-pointer"
         onClick={() => setShowSearch(true)}
       >
         <img
diff --git a/src/widgets/header/ui/MobileSideMenu.tsx b/src/widgets/header/ui/MobileSideMenu.tsx
index dbdb4b59..eb90e87f 100644
--- a/src/widgets/header/ui/MobileSideMenu.tsx
+++ b/src/widgets/header/ui/MobileSideMenu.tsx
@@ -48,6 +48,33 @@ export default function MobileSideMenu({
     handleClose();
   };
 
+  const handleLogout = async () => {
+    const res = await fetch("/api/auth/logout", {
+      method: "POST",
+      credentials: "include",
+    });
+
+    if (res.ok) {
+      handleClose();
+      router.push("/login");
+      router.refresh();
+      logout();
+      openModal("normal", {
+        message: "로그아웃이 완료되었습니다.",
+        onClick: () => {
+          closeModal();
+        },
+      });
+    } else {
+      openModal("normal", {
+        message: "로그아웃에 실패했습니다.",
+        onClick: () => {
+          closeModal();
+        },
+      });
+    }
+  };
+
   return (
     <div>
       <div
@@ -119,30 +146,16 @@ export default function MobileSideMenu({
                 <li>
                   <button
                     type="button"
-                    onClick={async () => {
-                      const res = await fetch("/api/auth/logout", {
-                        method: "POST",
-                        credentials: "include",
+                    onClick={() => {
+                      openModal("confirm", {
+                        message: "정말 로그아웃하시겠습니까?",
+                        onConfirm: async () => {
+                          await handleLogout();
+                        },
+                        onCancel: () => {
+                          closeModal();
+                        },
                       });
-                      handleClose();
-                      if (res.ok) {
-                        openModal("normal", {
-                          message: "로그아웃이 완료되었습니다.",
-                          onClick: () => {
-                            closeModal();
-                            logout();
-                            router.push("/login");
-                            router.refresh();
-                          },
-                        });
-                      } else {
-                        openModal("normal", {
-                          message: "로그아웃에 실패했습니다.",
-                          onClick: () => {
-                            closeModal();
-                          },
-                        });
-                      }
                     }}
                     className="w-full px-4 py-3 text-left text-red-400 hover:bg-white/10"
                   >
diff --git a/src/widgets/mypage/ui/Client/MyPage.client.tsx b/src/widgets/mypage/ui/Client/MyPage.client.tsx
index ddc35111..68faaaa5 100644
--- a/src/widgets/mypage/ui/Client/MyPage.client.tsx
+++ b/src/widgets/mypage/ui/Client/MyPage.client.tsx
@@ -69,7 +69,7 @@ export default function MyPageClient({ defaultTab }: { defaultTab: string }) {
         <Profile {...userProfile!} onEdit={openEditProfileModal} />
       )}
 
-      <section className="flex flex-col gap-[30px]">
+      <section className="flex w-full flex-col gap-[30px]">
         <Tab
           options={options}
           selected={selectedTab}
diff --git a/src/widgets/postDetail/ui/PostDetailSection.tsx b/src/widgets/postDetail/ui/PostDetailSection.tsx
index 947acd92..8a4cf2b2 100644
--- a/src/widgets/postDetail/ui/PostDetailSection.tsx
+++ b/src/widgets/postDetail/ui/PostDetailSection.tsx
@@ -144,7 +144,7 @@ export function PostDetailSection({ post }: { post: PostDetail }) {
             {seller?.nickname || "판매자"}
           </span>
         </div>
-        <div className="mx-4 h-px bg-gray-600 xl:hidden" />
+        <div className="h-px bg-gray-600 xl:hidden" />
       </div>
 
       <div className="flex flex-col justify-between gap-5 py-6 md:pt-8 xl:w-1/2 xl:pt-0 xl:pb-[88px]">
diff --git a/src/widgets/postDetail/ui/SellerPostsSection.tsx b/src/widgets/postDetail/ui/SellerPostsSection.tsx
index c2e86a7f..6f918191 100644
--- a/src/widgets/postDetail/ui/SellerPostsSection.tsx
+++ b/src/widgets/postDetail/ui/SellerPostsSection.tsx
@@ -18,6 +18,7 @@ export function SellerPostsSection({
     fetchNextPage,
     hasNextPage,
     isFetchingNextPage,
+    isLoading,
   } = useInfiniteQuery({
     queryKey: ["sellerPosts", sellerId, postingId],
     queryFn: ({ pageParam = 1 }) =>
@@ -33,6 +34,8 @@ export function SellerPostsSection({
     initialPageParam: 1,
   });
 
+  const sellerPosts = sellerPostsData?.pages.flatMap((p) => p.data) ?? [];
+
   const lastPostRef = useInfiniteScroll(
     () => {
       if (hasNextPage && !isFetchingNextPage) fetchNextPage();
@@ -41,24 +44,32 @@ export function SellerPostsSection({
     !!hasNextPage,
   );
 
-  const sellerPosts = sellerPostsData?.pages.flatMap((p) => p.data) ?? [];
-
   return (
-    <section className="mx-4 my-2 md:mx-10 xl:mx-16 xl:my-10">
-      <div className="mx-4 h-px bg-gray-600" />
+    <section className="mx-4 mb-2 md:mx-10 xl:mx-16 xl:mb-10">
+      <div className="h-px bg-gray-600" />
       <h1 className="my-6 text-2xl font-bold xl:text-3xl">판매한 상품</h1>
 
-      <div className="grid w-full grid-cols-2 gap-x-4 gap-y-8 md:grid-cols-4 xl:grid-cols-5">
-        {sellerPosts.map((item, idx) =>
-          idx === sellerPosts.length - 1 ? (
-            <div ref={lastPostRef} key={item.postingId}>
-              <PostCard {...item} />
-            </div>
-          ) : (
-            <PostCard key={item.postingId} {...item} />
-          ),
-        )}
-      </div>
+      {isLoading ? (
+        <div className="flex w-full flex-col items-center justify-center py-10 text-gray-400">
+          <p className="text-base md:text-lg">로딩 중...</p>
+        </div>
+      ) : sellerPosts.length === 0 ? (
+        <div className="flex w-full flex-col items-center justify-center py-10 text-gray-400">
+          <p className="text-base md:text-lg">판매한 상품이 없습니다.</p>
+        </div>
+      ) : (
+        <div className="grid w-full grid-cols-2 gap-x-4 gap-y-8 md:grid-cols-4 xl:grid-cols-5">
+          {sellerPosts.map((item, idx) =>
+            idx === sellerPosts.length - 1 ? (
+              <div ref={lastPostRef} key={item.postingId}>
+                <PostCard {...item} />
+              </div>
+            ) : (
+              <PostCard key={item.postingId} {...item} />
+            ),
+          )}
+        </div>
+      )}
     </section>
   );
 }