diff --git a/src/features/rolling-paper/components/rolling-paper-list.jsx b/src/features/rolling-paper/components/rolling-paper-list.jsx
index e71e048..7f91ba3 100644
--- a/src/features/rolling-paper/components/rolling-paper-list.jsx
+++ b/src/features/rolling-paper/components/rolling-paper-list.jsx
@@ -248,8 +248,15 @@ function RollingPaperList({ cardData, totalPages, currentPage, onTurnCards }) {
   const navigate = useNavigate();
 
   const handleCardClick = (cardId) => {
+    if(!cardId) {
+      navigate("*");
+      return;
+    }
+
     navigate(`/post/${cardId}`);
   };
+
+
   const profileImages = useMemo(
     () =>
       cardData.flatMap((card) =>
diff --git a/src/hooks/use-image-loader.jsx b/src/hooks/use-image-loader.jsx
index edfde97..f4dc4db 100644
--- a/src/hooks/use-image-loader.jsx
+++ b/src/hooks/use-image-loader.jsx
@@ -29,36 +29,51 @@ function useImageListLodeChecker(imageList = []) {
   useEffect(() => {
     if (!imageList.length) return;
 
+    let cancelled = false;
+
     setImageLoadStates((prev) => {
       const nextStates = { ...prev };
       imageList.forEach(({ id }) => {
-        if (nextStates[id] === undefined) {
-          nextStates[id] = false;
-        }
+        if (nextStates[id] === undefined) nextStates[id] = false;
       });
       return nextStates;
     });
 
+    const imageMap = {};
+
     imageList.forEach(({ id, backgroundImageURL }) => {
       setImageLoadStates((prev) => {
-        if (prev[id]) return prev;
+        if (prev[id] === true) return prev;
 
-        if (!backgroundImageURL) {
-          return { ...prev, [id]: false };
-        }
+        if (!backgroundImageURL) return { ...prev, [id]: false };
 
         const img = new Image();
-        img.src = backgroundImageURL;
+        imageMap[id] = img;
+
         img.onload = () => {
-          setImageLoadStates((p) => ({ ...p, [id]: true }));
+          if (!cancelled) {
+            setImageLoadStates((p) => ({ ...p, [id]: true }));
+          }
         };
+
         img.onerror = () => {
-          setImageLoadStates((p) => ({ ...p, [id]: false }));
+          if (!cancelled) {
+            setImageLoadStates((p) => ({ ...p, [id]: false }));
+          }
         };
 
+        img.src = backgroundImageURL;
         return prev;
       });
     });
+
+    return () => {
+      cancelled = true;
+      Object.values(imageMap).forEach((img) => {
+        img.onload = null;
+        img.onerror = null;
+      });
+    };
   }, [imageList]);
 
   return imageLoadStates;
diff --git a/src/pages/404-page.jsx b/src/pages/404-page.jsx
index e0354cd..d88d9c9 100644
--- a/src/pages/404-page.jsx
+++ b/src/pages/404-page.jsx
@@ -45,20 +45,20 @@ const ErrorNumber = styled.h1`
   font-weight: 900;
   color: var(--color-purple-700);
   margin: 0;
-  font-size: 200px;
+  font-size: 150px;
 
   ${media.mobile} {
-    font-size: 130px;
+    font-size: 110px;
   }
 `;
 
 const ErrorComment = styled.span`
-  font-size: 80px;
+  font-size: 70px;
   color: #6e6293;
   font-weight: 700;
 
   em {
-    font-size: 100px;
+    font-size: 90px;
     font-weight: 800;
     font-style: normal;
     color: #240079;
@@ -72,24 +72,20 @@ const ErrorComment = styled.span`
   }
 
   ${media.mobile} {
-    font-size: 50px;
+    font-size: 40px;
     em {
-      font-size: 60px;
+      font-size: 50px;
     }
   }
 `;
 
 const ErrorCommentSofter = styled.span`
-  font-size: 50px;
+  font-size: 25px;
   color: #6e6293;
   font-weight: 400;
 
-  ${media.tablet} {
-    font-size: 40px;
-  }
-
   ${media.mobile} {
-    font-size: 30px;
+    font-size: 18px;
   }
 `;
 
@@ -133,10 +129,10 @@ const Error404Page = () => {
           <AirplaneSVG src={logoImage} />
           <ErrorNumber>404</ErrorNumber>
           <ErrorComment>
-            <em>Oops!</em> Page Not Found...
+            <em>앗 이런!</em> 페이지를 찾을 수 없습니다.
           </ErrorComment>
           <ErrorCommentSofter>
-            Don't worry, let's get you back on track.
+            페이지의 주소가 올바르지 않거나, 삭제 또는 다른 페이지로 변경되었습니다.
           </ErrorCommentSofter>
           <HomeButton
             size={BUTTON_SIZE.large}
diff --git a/src/pages/create-post-page.jsx b/src/pages/create-post-page.jsx
index cba1a1b..b4edc9d 100644
--- a/src/pages/create-post-page.jsx
+++ b/src/pages/create-post-page.jsx
@@ -11,6 +11,8 @@ import BackgroundSelect from "../components/option/background-select";
 import TextField from "../components/text-field/text-field";
 import TEXT_FIELD_TYPE from "../components/text-field/text-field-type";
 import { media } from "../utils/media";
+import Toast from "../components/toast/toast";
+import { useToast } from "../hooks/use-toast";
 
 const PostContainer = styled.div`
   display: flex;
@@ -77,8 +79,15 @@ function CreatePostPage() {
   const [selected, setSelected] = useState(0);
   const [backgroundUrls, setBackgroundUrls] = useState([]);
   const [loading, setLoading] = useState(false);
+  const [toastMessage, setToastMessage] = useState();
   const navigate = useNavigate();
 
+  const { showsToast, isOpen, setShowsToast, onDismiss } = useToast({
+    timeout: 5000,
+  });
+
+  const handleToastCloseClick = () => setShowsToast(false);
+
   const colorOptions = [
     { label: "beige", color: BACKGROUND_COLOR.beige },
     { label: "purple", color: BACKGROUND_COLOR.purple },
@@ -137,7 +146,8 @@ function CreatePostPage() {
       navigate(`/post/${newPostId}`);
     } catch (error) {
       console.error("게시물 생성 실패:", error);
-      alert("게시물 생성에 실패했습니다. 다시 시도해 주세요");
+      setToastMessage("게시물 생성에 실패했습니다. 다시 시도해 주세요.")
+      setShowsToast(true);
     } finally {
       setLoading(false);
     }
@@ -189,6 +199,15 @@ function CreatePostPage() {
           onClick={handleCreate}
         />
       </ButtonWrapper>
+
+      {showsToast&&
+        <Toast
+          isOpen={isOpen}
+          message={`${toastMessage} 🚨`}
+          onClose={handleToastCloseClick}
+          onDismiss={onDismiss}
+        />
+      }
     </PostContainer>
   );
 }
diff --git a/src/pages/messages-page.jsx b/src/pages/messages-page.jsx
index 25f37c9..a15245f 100644
--- a/src/pages/messages-page.jsx
+++ b/src/pages/messages-page.jsx
@@ -25,6 +25,8 @@ import { useMedia } from "../hooks/use-media";
 import { useModalDialog } from "../hooks/use-modal-dialog";
 import ContentLayout from "../layouts/content-layout";
 import { media } from "../utils/media";
+import Toast from "../components/toast/toast";
+import { useToast } from "../hooks/use-toast";
 
 const Content = styled.div`
   & > div {
@@ -111,6 +113,8 @@ function MessagesPage() {
     onPrimaryAction,
     onDismissDialog,
   } = useModalDialog();
+  const [toastMessage, setToastMessage] = useState();
+  const [hasMoreMessages, setHasMoreMessages] = useState(true);
 
   const isEditing = useMemo(
     () => location.pathname.includes("edit"),
@@ -121,6 +125,12 @@ function MessagesPage() {
     navigate("edit");
   };
 
+  const { showsToast, isOpen, setShowsToast, onDismiss } = useToast({
+    timeout: 5000,
+  });
+
+  const handleToastCloseClick = () => setShowsToast(false);
+
   const handleRollingPaperDelete = () => {
     openDialog({
       title: `${recipient.name} 님의 롤링 페이퍼를 삭제할까요?`,
@@ -130,8 +140,9 @@ function MessagesPage() {
           await deleteRecipient({ id: recipient.id });
           navigate(`/list`);
         } catch (error) {
-          // TODO: Error 처리
           console.log(error);
+          setToastMessage(error);
+          setShowsToast(true);
         }
       },
     });
@@ -152,8 +163,9 @@ function MessagesPage() {
             prev.filter((prevMessage) => prevMessage.id !== message.id)
           );
         } catch (error) {
-          // TODO: Error 처리
           console.log(error);
+          setToastMessage(error);
+          setShowsToast(true);
         }
       },
     });
@@ -168,8 +180,11 @@ function MessagesPage() {
   };
 
   const handleInfiniteScroll = async () => {
-    const messages = await getNextPageMessages();
-    if (!messages) return;
+    if (!hasMoreMessages) return;
+
+    try {
+       const messages = await getNextPageMessages();
+       if (!messages) return;
 
     setMessages((prev) => {
       const newMessages = [...prev];
@@ -181,6 +196,12 @@ function MessagesPage() {
 
       return newMessages;
     });
+    } catch(error) {
+      console.error(error);
+      setToastMessage(error);
+      setShowsToast(true);
+      setHasMoreMessages(false);
+    }
   };
 
   useEffect(() => {
@@ -196,11 +217,12 @@ function MessagesPage() {
       } catch (error) {
         // TODO: Error 처리 필요
         console.error(error);
+        navigate("/notfound", { replace: true });
       }
     }
 
     fetchRollingPaper();
-  }, [id]);
+  }, [id, navigate]);
 
   const content = (
     <>
@@ -270,6 +292,15 @@ function MessagesPage() {
           }
         />
       </Modal>
+
+      {showsToast&&
+        <Toast
+          isOpen={isOpen}
+          message={`${toastMessage} 🚨`}
+          onClose={handleToastCloseClick}
+          onDismiss={onDismiss}
+        />
+      }
     </ContentLayout>
   );
 }
diff --git a/src/pages/rolling-paper-list-page.jsx b/src/pages/rolling-paper-list-page.jsx
index 7e780dc..1f6f507 100644
--- a/src/pages/rolling-paper-list-page.jsx
+++ b/src/pages/rolling-paper-list-page.jsx
@@ -7,6 +7,8 @@ import BUTTON_SIZE from "../components/button/button-size";
 import RollingPaperList from "../features/rolling-paper/components/rolling-paper-list";
 import { useMedia } from "../hooks/use-media";
 import { media } from "../utils/media";
+import Toast from "../components/toast/toast";
+import { useToast } from "../hooks/use-toast";
 
 const TopContainer = styled.div`
   text-align: center;
@@ -71,9 +73,8 @@ function getCachedImage(url) {
   return cache[url].src;
 }
 
-function RollingPaperListPage() {
-  const navigate = useNavigate();
 
+function RollingPaperListPage() {
   const [recipientsData, setRecipientsData] = useState([]);
   const [popularDataList, setPopularDataList] = useState([]);
   const [recentDataList, setRecentDataList] = useState([]);
@@ -81,6 +82,15 @@ function RollingPaperListPage() {
   const [recentCurrentPage, setRecentCurrentPage] = useState(0);
   const [cardCount, setCardCount] = useState(4);
   const { isDesktop } = useMedia();
+  const [isCalledApi, setIsCalledApi] = useState(true);
+  const [toastMessage, setToastMessage] = useState();
+  const navigate = useNavigate();
+
+  const { showsToast, isOpen, setShowsToast, onDismiss } = useToast({
+    timeout: 5000,
+  });
+
+  const handleToastCloseClick = () => setShowsToast(false);
 
   useEffect(() => {
     isDesktop ? setCardCount(4) : setCardCount(null);
@@ -90,16 +100,24 @@ function RollingPaperListPage() {
     navigate("/post");
   };
 
+
   useEffect(() => {
-    apiClient
-      .get("/recipients/")
-      .then((res) => {
+    if (!isCalledApi) return;
+
+    const fetchData = async () => {
+      try {
+        const res = await apiClient.get("/recipients/");
         setRecipientsData(res.data.results);
-      })
-      .catch((err) => {
+      } catch (err) {
         console.error("오류:", err);
-      });
-  }, []);
+        setToastMessage("메시지를 가져오는 중 오류가 발생했어요.")
+        setShowsToast(true);
+      } finally {
+        setIsCalledApi(false);
+      }
+    };
+    fetchData();
+  }, [isCalledApi, setShowsToast]);
 
   useEffect(() => {
     recipientsData.forEach((data) => {
@@ -183,6 +201,15 @@ function RollingPaperListPage() {
           onClick={handleMakingButton}
         />
       </ButtonFooter>
+
+      {showsToast&&
+        <Toast
+          isOpen={isOpen}
+          message={`${toastMessage} 🚨`}
+          onClose={handleToastCloseClick}
+          onDismiss={onDismiss}
+        />
+      }
     </TopContainer>
   );
 }
diff --git a/src/pages/send-message-page.jsx b/src/pages/send-message-page.jsx
index 79e134a..aa97c67 100644
--- a/src/pages/send-message-page.jsx
+++ b/src/pages/send-message-page.jsx
@@ -12,6 +12,8 @@ import TextEditor from "../components/text-editor/text-editor";
 import TextField from "../components/text-field/text-field";
 import TEXT_FIELD_TYPE from "../components/text-field/text-field-type";
 import { media } from "../utils/media";
+import Toast from "../components/toast/toast";
+import { useToast } from "../hooks/use-toast";
 
 const SendContainer = styled.div`
   display: flex;
@@ -110,8 +112,15 @@ function SendMessagePage() {
     title: "Noto Sans",
     fontFamily: "Noto Sans",
   });
+  const [toastMessage, setToastMessage] = useState();
   const navigate = useNavigate();
 
+  const { showsToast, isOpen, setShowsToast, onDismiss } = useToast({
+    timeout: 5000,
+  });
+
+  const handleToastCloseClick = () => setShowsToast(false);
+
   const handleChange = (e) => {
     const value = e.target.value;
     setName(value);
@@ -169,6 +178,8 @@ function SendMessagePage() {
       navigate(`/post/${recipientId}`);
     } catch (error) {
       console.error("메시지 저장 실패:", error);
+      setToastMessage("메시지를 저장하는 중 오류가 발생했어요.")
+      setShowsToast(true);
     }
   };
 
@@ -264,6 +275,15 @@ function SendMessagePage() {
           onClick={handleCreate}
         />
       </ButtonWrapper>
+
+      {showsToast&&
+        <Toast
+          isOpen={isOpen}
+          message={`${toastMessage} 🚨`}
+          onClose={handleToastCloseClick}
+          onDismiss={onDismiss}
+        />
+      }
     </SendContainer>
   );
 }