diff --git a/.vscode/settings.json b/.vscode/settings.json
index c1c068c..1dc93b2 100644
--- a/.vscode/settings.json
+++ b/.vscode/settings.json
@@ -14,13 +14,9 @@
   ],
   "eslint.workingDirectories": [
     {
-      "mode": "auto",
+      "mode": "auto"
     }
   ],
-  "cSpell.words": [
-    "kakao",
-    "signup",
-    "webp"
-  ],
+  "cSpell.words": ["kakao", "signup", "webp"],
   "editor.tabSize": 2
 }
diff --git a/apps/client/src/apis/axios.ts b/apps/client/src/apis/axios.ts
index 3d6e249..ba13f43 100644
--- a/apps/client/src/apis/axios.ts
+++ b/apps/client/src/apis/axios.ts
@@ -1,4 +1,4 @@
-import axios, { AxiosError } from 'axios';
+import axios, { AxiosError } from "axios";
 
 const axiosInstance = axios.create({
   baseURL: process.env.SERVER_URL,
@@ -6,26 +6,29 @@ const axiosInstance = axios.create({
 });
 
 axiosInstance.interceptors.response.use(
-  response => {
+  (response) => {
     return response;
   },
-  async error => {
+  async (error) => {
     const customError = error as AxiosError;
     const axiosError = customError.response?.status as number;
 
-
     // 401 에러 응답 (인가 미들웨어에서 모든 토큰이 만료되었을때 401 리턴 -> 로그인 유도)
-    if ((axiosError === 401) && (window.location.pathname !== '/')) {
-      if (/^\/cake\/[^/]+$/.test(window.location.pathname)) {
+    if (axiosError === 401 && window.location.pathname !== "/") {
+      if (
+        /^\/cake\/[^/]+$/.test(window.location.pathname) ||
+        /^\/letter\/choose\/[^/]+$/.test(window.location.pathname) ||
+        /^\/letter\/create\/[^/]+$/.test(window.location.pathname)
+      ) {
         return Promise.reject(error);
       }
-      window.location.replace('/');
+      window.location.replace("/");
       return Promise.reject(error);
     }
 
     // 500 에러 응답
     if (axiosError === 500) {
-      console.log('서버 오류');
+      console.log("서버 오류");
       return Promise.reject(error);
     }
 
@@ -35,8 +38,7 @@ axiosInstance.interceptors.response.use(
     }
 
     return Promise.reject(error);
-  },
+  }
 );
 
-
 export default axiosInstance;
diff --git a/apps/client/src/components/cake/CakeInfo.tsx b/apps/client/src/components/cake/CakeInfo.tsx
index cc07ced..2f97461 100644
--- a/apps/client/src/components/cake/CakeInfo.tsx
+++ b/apps/client/src/components/cake/CakeInfo.tsx
@@ -21,7 +21,6 @@ import { useQueryClient } from '@tanstack/react-query';
 import { useGetCakeLetters } from '#apis/cake/useGetCakeLetters.tsx';
 import { useGetLetter } from '#apis/letter/useGetLetter.tsx';
 
-
 interface CakeInfoProps {
   year: string;
   sheetColor: CakeColorType | null;
@@ -55,7 +54,11 @@ const CakeInfo: React.FC<CakeInfoProps> = ({
     totalPage: 1,
   });
   const queryClient = useQueryClient();
-  const { data: cakeLettersData } = useGetCakeLetters(ownerId!, year, pageData.currentPage);
+  const { data: cakeLettersData } = useGetCakeLetters(
+    ownerId!,
+    year,
+    pageData.currentPage
+  );
   const { data: letterData } = useGetLetter(selectedLetterId!);
 
   useEffect(() => {
@@ -68,7 +71,8 @@ const CakeInfo: React.FC<CakeInfoProps> = ({
       setCakeData(result.data);
       setPageData({
         currentPage: result.currentPage,
-        totalPage: result.totalPage === 0 ? result.totalPage + 1 : result.totalPage,
+        totalPage:
+          result.totalPage === 0 ? result.totalPage + 1 : result.totalPage,
       });
     }
   }, [cakeLettersData]);
@@ -128,8 +132,10 @@ const CakeInfo: React.FC<CakeInfoProps> = ({
           keyword={selectedItem?.keyword ?? ''}
         />
       )}
-      <Modal open={open}>
-        <span>편지 내용은 생일 이후에 확인할 수 있어요!{'\n'}두근두근...👉👈</span>
+      <Modal open={open} onClose={() => setOpen(false)}>
+        <span id="modal-description">
+          편지 내용은 생일 이후에 확인할 수 있어요!{'\n'}두근두근...👉👈
+        </span>
         <Button
           type="default"
           onClick={() => {
diff --git a/apps/client/src/components/cake/GridInfo.tsx b/apps/client/src/components/cake/GridInfo.tsx
index 4afa3d6..cdcac11 100644
--- a/apps/client/src/components/cake/GridInfo.tsx
+++ b/apps/client/src/components/cake/GridInfo.tsx
@@ -1,4 +1,10 @@
-import React, { useState, CSSProperties, useRef, useEffect, useCallback } from 'react';
+import React, {
+  useState,
+  CSSProperties,
+  useRef,
+  useEffect,
+  useCallback,
+} from 'react';
 import { useParams } from 'react-router-dom';
 import * as G from '#styles/GridStyle.tsx';
 import { FixedSizeGrid as Grid } from 'react-window';
@@ -21,8 +27,10 @@ import Modal from '#components/modal/Modal.tsx';
 
 const GRID_PAGE = 24;
 
-
-const GridInfo: React.FC<{ year: string, handleTotalChange?: (total: number) => void }> = ({ year: init, handleTotalChange }) => {
+const GridInfo: React.FC<{
+  year: string;
+  handleTotalChange?: (total: number) => void;
+}> = ({ year: init, handleTotalChange }) => {
   const [year, setYear] = useState(init);
   const [cakeData, setCakeData] = useState<getCakeDataRes[]>([]);
   const [page, setPage] = useState(1);
@@ -39,13 +47,15 @@ const GridInfo: React.FC<{ year: string, handleTotalChange?: (total: number) =>
   const COL_WIDTH = isPC ? 155 : 130;
   const WIDTH = isPC ? 155 * 5 : 390;
 
-  const { data, isFetching } = year === 'all'
-    ? useGetMyLetters(page)
-    : useGetLetters(ownerId!, year, page);
+  const { data, isFetching } =
+    year === 'all'
+      ? useGetMyLetters(page)
+      : useGetLetters(ownerId!, year, page);
 
-  const { data: letterData } = year === 'all'
-    ? useGetAllLetter(selectedLetterId!)
-    : useGetLetter(selectedLetterId!);
+  const { data: letterData } =
+    year === 'all'
+      ? useGetAllLetter(selectedLetterId!)
+      : useGetLetter(selectedLetterId!);
 
   useEffect(() => {
     if (data) {
@@ -59,7 +69,9 @@ const GridInfo: React.FC<{ year: string, handleTotalChange?: (total: number) =>
         const result = getCakeLettersRes.parse(data);
         setNoData(false);
         setHasMore(result.data.length >= GRID_PAGE);
-        setCakeData((prev) => (page === 1 ? result.data : [...prev, ...result.data]));
+        setCakeData((prev) =>
+          page === 1 ? result.data : [...prev, ...result.data]
+        );
         handleTotalChange?.(result.totalPage);
       }
     }
@@ -202,8 +214,10 @@ const GridInfo: React.FC<{ year: string, handleTotalChange?: (total: number) =>
         candleImageUrl={selectedItem?.candleImageUrl ?? ''}
         keyword={selectedItem?.keyword ?? ''}
       />
-      <Modal open={open}>
-        <span>편지 내용은 생일 이후에 확인할 수 있어요!</span>
+      <Modal open={open} onClose={() => setOpen(false)}>
+        <span id="modal-description">
+          편지 내용은 생일 이후에 확인할 수 있어요!
+        </span>
         <Button
           type="default"
           onClick={() => {
diff --git a/apps/client/src/components/cake/SharedCake.tsx b/apps/client/src/components/cake/SharedCake.tsx
index 507bc26..6486cef 100644
--- a/apps/client/src/components/cake/SharedCake.tsx
+++ b/apps/client/src/components/cake/SharedCake.tsx
@@ -1,6 +1,6 @@
 import React, { useState } from 'react';
 import { useNavigate } from 'react-router-dom';
-import * as C from '#styles/CakeStyle.tsx'
+import * as C from '#styles/CakeStyle.tsx';
 
 import CakeHeader from '#components/cake/CakeHeader.tsx';
 import CakeInfo from '#components/cake/CakeInfo.tsx';
@@ -71,21 +71,17 @@ const SharedCake: React.FC<MyCakeProps> = ({ ownerId, data }) => {
         isMyCake={false}
       />
       <C.Buttons>
-        <Button
-          type="default"
-          onClick={handleCheckLogin}
-        >
+        <Button type="default" onClick={handleCheckLogin}>
           케이크 꾸며주기
         </Button>
-        <Button
-          type="default"
-          onClick={handleNavigateToMyCake}
-        >
+        <Button type="default" onClick={handleNavigateToMyCake}>
           내 케이크 보러가기
         </Button>
       </C.Buttons>
-      <Modal open={open}>
-        <span>편지를 작성하면 포인트를 얻을 수 있어요.{'\n'}로그인 하시겠어요?</span>
+      <Modal open={open} onClose={() => setOpen(false)}>
+        <span id="modal-description">
+          편지를 작성하면 포인트를 얻을 수 있어요.{'\n'}로그인 하시겠어요?
+        </span>
         <Button
           type="default"
           onClick={() => {
diff --git a/apps/client/src/components/modal/LoginModal.tsx b/apps/client/src/components/modal/LoginModal.tsx
index 6217ee1..4a114a2 100644
--- a/apps/client/src/components/modal/LoginModal.tsx
+++ b/apps/client/src/components/modal/LoginModal.tsx
@@ -13,8 +13,8 @@ const LoginModal = ({
   const navigate = useNavigate();
 
   return (
-    <Modal open={open}>
-      <span>로그인이 필요합니다.</span>
+    <Modal open={open} onClose={handleOpen}>
+      <span id="modal-title">로그인이 필요합니다.</span>
       <Button
         type="default"
         onClick={() => {
diff --git a/apps/client/src/components/modal/Modal.tsx b/apps/client/src/components/modal/Modal.tsx
index ecb1208..e3d4bee 100644
--- a/apps/client/src/components/modal/Modal.tsx
+++ b/apps/client/src/components/modal/Modal.tsx
@@ -1,18 +1,46 @@
-import React from 'react';
+import React, { useEffect, useRef } from 'react';
 import styled from 'styled-components';
 import { ModalPortal } from '../../ModalPortal';
 
 const Modal = ({
   open,
+  onClose,
   children,
 }: {
   open: boolean;
+  onClose: () => void;
   children: React.ReactNode;
 }) => {
+  const modalRef = useRef<HTMLDivElement>(null);
+
+  useEffect(() => {
+    const handleKey = (e: KeyboardEvent) => {
+      if (e.key === 'Escape') {
+        onClose();
+      }
+    };
+
+    if (open) {
+      document.addEventListener('keydown', handleKey);
+    }
+
+    return () => {
+      document.removeEventListener('keydown', handleKey);
+    };
+  }, [open, onClose]);
+
   return (
     <ModalPortal>
       <Overlay open={open}>
-        <ModalContainer>{children}</ModalContainer>
+        <ModalContainer
+          ref={modalRef}
+          role="dialog"
+          aria-modal="true"
+          aria-labelledby="modal-title"
+          aria-describedby="modal-description"
+        >
+          {children}
+        </ModalContainer>
       </Overlay>
     </ModalPortal>
   );
diff --git a/apps/client/src/components/modal/ShareUrlModal.tsx b/apps/client/src/components/modal/ShareUrlModal.tsx
index baa2cfb..572c37a 100644
--- a/apps/client/src/components/modal/ShareUrlModal.tsx
+++ b/apps/client/src/components/modal/ShareUrlModal.tsx
@@ -30,7 +30,7 @@ function kakaoShare(nickname: string) {
 
 function facebookShare(nickname: string) {
   window.open(
-    `https://www.facebook.com/sharer/sharer.php?u=${window.location.href}&title=${nickname}님의 케이크`,
+    `https://www.facebook.com/sharer/sharer.php?u=${window.location.href}&title=${nickname}님의 케이크`
   );
 }
 
@@ -50,10 +50,10 @@ const ShareUrlModal = ({
   }, []);
 
   return (
-    <Modal open={open}>
+    <Modal open={open} onClose={handleOpen}>
       <ShareBox>
-        <h3>내 케이크 공유하기</h3>
-        <div>
+        <h3 id="modal-title">내 케이크 공유하기</h3>
+        <div id="modal-description">
           <IconButton onClick={() => kakaoShare(nickname)}>
             <KakaoLogoIcon width={'3rem'} height={'3rem'} />
           </IconButton>
@@ -64,7 +64,7 @@ const ShareUrlModal = ({
             <LinkIcon width={'3rem'} height={'3rem'} />
           </IconButton>
         </div>
-        <Button type="default" onClick={handleOpen} >
+        <Button type="default" onClick={handleOpen}>
           닫기
         </Button>
       </ShareBox>
@@ -87,4 +87,4 @@ const ShareBox = styled.div`
   justify-content: center;
   align-items: center;
   gap: 24px;
-`
+`;
diff --git a/apps/client/src/pages/ChooseCandle.tsx b/apps/client/src/pages/ChooseCandle.tsx
index 395ee3c..f7cc477 100644
--- a/apps/client/src/pages/ChooseCandle.tsx
+++ b/apps/client/src/pages/ChooseCandle.tsx
@@ -48,7 +48,7 @@ const ChooseCandle = () => {
     try {
       // 선택한 장식초 정보 가져오기
       const candleResponse = await axiosInstance.get<CandleType>(
-        `/candle/${candleId}`,
+        `/candle/${candleId}`
       );
       if (candleResponse.status === 200) {
         const data = CandleType.parse(candleResponse.data);
@@ -118,7 +118,7 @@ const ChooseCandle = () => {
                 if (candle.point === 0) {
                   // 무료 장식초: 편지 페이지로 이동
                   navigate(
-                    `/letter/create/${ownerId}?candleId=${candle.candleId}`,
+                    `/letter/create/${ownerId}?candleId=${candle.candleId}`
                   );
                 } else {
                   // 유료 장식초: 결제 혹은 로그인 유도 모달 띄우기
@@ -135,15 +135,15 @@ const ChooseCandle = () => {
             </CandleButton>
           ))}
         </CandleContainer>
-        <Modal open={openBuy}>
+        <Modal open={openBuy} onClose={handleOpenBuy}>
           <img
             style={{ width: '5rem', height: '5rem' }}
             src={candle?.imageUrl}
             alt={candle?.candleId.toString()}
           />
-          <h3>해당 장식초를 구매하시겠습니까?</h3>
+          <h3 id="modal-title">해당 장식초를 구매하시겠습니까?</h3>
           <span>남은 포인트: {userPoint}P</span>
-          <span>결제 포인트: {candle?.point}P</span>
+          <span id="modal-description">결제 포인트: {candle?.point}P</span>
           {!isEnoughPoint && (
             <span style={{ color: 'red' }}>포인트가 부족합니다.</span>
           )}
@@ -155,11 +155,7 @@ const ChooseCandle = () => {
               gap: '1rem',
             }}
           >
-            <Button
-              type="gray"
-              size="large"
-              onClick={handleOpenBuy}
-            >
+            <Button type="gray" size="large" onClick={handleOpenBuy}>
               취소
             </Button>
             <Button
@@ -174,18 +170,20 @@ const ChooseCandle = () => {
             </Button>
           </div>
         </Modal>
-        <Modal open={openSuccess}>
+        <Modal open={openSuccess} onClose={() => setOpenSuccess(false)}>
           <img
             style={{ width: '5rem', height: '5rem' }}
             src={candle?.imageUrl}
             alt={candle?.candleId.toString()}
           />
-          <h3>장식초 구매가 완료되었습니다.</h3>
-          <span>남은 포인트: {userPoint}P</span>
+          <h3 id="modal-title">장식초 구매가 완료되었습니다.</h3>
+          <span id="modal-description">남은 포인트: {userPoint}P</span>
           <Button
             type="default"
             onClick={() => {
-              navigate(`/letter/create/${ownerId}?candleId=${candle?.candleId}`);
+              navigate(
+                `/letter/create/${ownerId}?candleId=${candle?.candleId}`
+              );
             }}
           >
             확인
diff --git a/packages/eslint-config/base.js b/packages/eslint-config/base.js
index 23d5c5d..9e82be0 100644
--- a/packages/eslint-config/base.js
+++ b/packages/eslint-config/base.js
@@ -2,47 +2,47 @@ module.exports = {
   extends: [
     "eslint:recommended",
     "plugin:prettier/recommended",
-    //"plugin:@typescript-eslint/recommended",
+    "plugin:@typescript-eslint/recommended",
     "plugin:@typescript-eslint/recommended-type-checked",
     "plugin:@typescript-eslint/stylistic-type-checked",
     "plugin:@typescript-eslint/strict-type-checked",
-    "plugin:sonarjs/recommended-legacy"
+    "plugin:sonarjs/recommended-legacy",
   ],
   parser: "@typescript-eslint/parser",
   rules: {
-    "quotes": ["error", "single"],
+    quotes: ["error", "single"],
     "prettier/prettier": [
       "error",
       {
         endOfLine: "auto",
-        singleQuote: true
-      }
+        singleQuote: true,
+      },
     ],
     "@typescript-eslint/naming-convention": [
       "error",
       {
-        selector: "typeAlias",  // 타입선언
+        selector: "typeAlias", // 타입선언
         format: ["camelCase", "PascalCase"],
       },
       {
-        selector: "memberLike",  // Property 멤버
+        selector: "memberLike", // Property 멤버
         format: ["camelCase"],
       },
       {
-        selector: "function",  // function
+        selector: "function", // function
         format: ["camelCase"],
       },
       {
-        selector: "variable",  // 변수
+        selector: "variable", // 변수
         format: ["camelCase", "PascalCase", "UPPER_CASE"],
       },
       {
-        selector: "parameter",  // 파라미터
+        selector: "parameter", // 파라미터
         format: ["camelCase"],
         leadingUnderscore: "allow",
       },
       {
-        selector: "enumMember",  // enum
+        selector: "enumMember", // enum
         format: ["UPPER_CASE"],
       },
     ],