diff --git a/web/jest.config.js b/web/jest.config.js
index 9302e6e5..446412e0 100644
--- a/web/jest.config.js
+++ b/web/jest.config.js
@@ -3,4 +3,7 @@
 module.exports = {
   preset: "ts-jest",
   testEnvironment: "node",
+  moduleNameMapper: {
+    "lodash-es": "lodash",
+  },
 };
diff --git a/web/package.json b/web/package.json
index 3ceb3c5e..89716fe2 100644
--- a/web/package.json
+++ b/web/package.json
@@ -40,6 +40,7 @@
     "eslint-plugin-react": "^7.27.1",
     "jest": "^29.1.2",
     "less": "^4.1.1",
+    "lodash": "^4.17.21",
     "postcss": "^8.4.5",
     "prettier": "2.5.1",
     "tailwindcss": "^3.0.18",
diff --git a/web/src/components/Memo.tsx b/web/src/components/Memo.tsx
index 5844cdaa..976b262d 100644
--- a/web/src/components/Memo.tsx
+++ b/web/src/components/Memo.tsx
@@ -1,6 +1,5 @@
 import dayjs from "dayjs";
 import relativeTime from "dayjs/plugin/relativeTime";
-import { indexOf } from "lodash-es";
 import { memo, useEffect, useRef, useState } from "react";
 import { useTranslation } from "react-i18next";
 import { useNavigate } from "react-router-dom";
@@ -132,7 +131,7 @@ const Memo: React.FC<Props> = (props: Props) => {
       const todoElementList = [...(memoContainerRef.current?.querySelectorAll(`span.todo-block[data-value=${status}]`) ?? [])];
       for (const element of todoElementList) {
         if (element === targetEl) {
-          const index = indexOf(todoElementList, element);
+          const index = todoElementList.indexOf(element);
           const tempList = memo.content.split(status === "DONE" ? /- \[x\] / : /- \[ \] /);
           let finalContent = "";
 
diff --git a/web/src/components/Settings/MemberSection.tsx b/web/src/components/Settings/MemberSection.tsx
index 0c6019dd..ad4980d0 100644
--- a/web/src/components/Settings/MemberSection.tsx
+++ b/web/src/components/Settings/MemberSection.tsx
@@ -1,4 +1,3 @@
-import { isEmpty } from "lodash-es";
 import React, { useEffect, useState } from "react";
 import { useTranslation } from "react-i18next";
 import { userService } from "../../services";
@@ -47,7 +46,7 @@ const PreferencesSection = () => {
   };
 
   const handleCreateUserBtnClick = async () => {
-    if (isEmpty(state.createUserEmail) || isEmpty(state.createUserPassword)) {
+    if (state.createUserEmail === "" || state.createUserPassword === "") {
       toastHelper.error(t("message.fill-form"));
       return;
     }
diff --git a/web/src/helpers/utils.ts b/web/src/helpers/utils.ts
index 86541e1c..bbc314ee 100644
--- a/web/src/helpers/utils.ts
+++ b/web/src/helpers/utils.ts
@@ -1,7 +1,5 @@
-import { assign, isNull, isUndefined } from "lodash-es";
-
 export const isNullorUndefined = (value: any) => {
-  return isNull(value) || isUndefined(value);
+  return value === null || value === undefined;
 };
 
 export function getNowTimeStamp(): number {
@@ -96,7 +94,7 @@ export const getElementBounding = (element: HTMLElement, relativeEl?: HTMLElemen
   };
 
   if ((relativeEl.tagName !== "BODY" && relativeElPosition === "relative") || relativeElPosition === "sticky") {
-    return assign(bounding, {
+    return Object.assign(bounding, {
       top: elementRect.top - relativeElRect.top,
       left: elementRect.left - relativeElRect.left,
     });
@@ -117,13 +115,13 @@ export const getElementBounding = (element: HTMLElement, relativeEl?: HTMLElemen
   };
 
   if (isElementFixed(element)) {
-    return assign(bounding, {
+    return Object.assign(bounding, {
       top: elementRect.top,
       left: elementRect.left,
     });
   }
 
-  return assign(bounding, {
+  return Object.assign(bounding, {
     top: elementRect.top + scrollTop,
     left: elementRect.left + scrollLeft,
   });
diff --git a/web/src/labs/marked/index.ts b/web/src/labs/marked/index.ts
index bafa9194..c7580be8 100644
--- a/web/src/labs/marked/index.ts
+++ b/web/src/labs/marked/index.ts
@@ -27,6 +27,10 @@ export const marked = (markdownStr: string, blockParsers = blockElementParserLis
   let matchedIndex = -1;
 
   for (const parser of inlineElementParserList) {
+    if (parser.name === "plain text" && matchedInlineParser !== undefined) {
+      continue;
+    }
+
     const startIndex = markdownStr.search(parser.regex);
     const matchedLength = match(markdownStr, parser.regex);
 
diff --git a/web/src/labs/marked/marked.test.ts b/web/src/labs/marked/marked.test.ts
index ecb79071..9581fd3c 100644
--- a/web/src/labs/marked/marked.test.ts
+++ b/web/src/labs/marked/marked.test.ts
@@ -1,4 +1,5 @@
 import { describe, expect, test } from "@jest/globals";
+import { unescape } from "lodash-es";
 import { marked } from ".";
 
 describe("test marked parser", () => {
@@ -27,7 +28,7 @@ console.log("hello world!")
     ];
 
     for (const t of tests) {
-      expect(marked(t.markdown)).toBe(t.want);
+      expect(unescape(marked(t.markdown))).toBe(t.want);
     }
   });
   test("parse todo list block", () => {
@@ -43,7 +44,7 @@ console.log("hello world!")
     ];
 
     for (const t of tests) {
-      expect(marked(t.markdown)).toBe(t.want);
+      expect(unescape(marked(t.markdown))).toBe(t.want);
     }
   });
   test("parse list block", () => {
@@ -59,7 +60,7 @@ console.log("hello world!")
     ];
 
     for (const t of tests) {
-      expect(marked(t.markdown)).toBe(t.want);
+      expect(unescape(marked(t.markdown))).toBe(t.want);
     }
   });
   test("parse inline element", () => {
@@ -71,7 +72,7 @@ console.log("hello world!")
     ];
 
     for (const t of tests) {
-      expect(marked(t.markdown)).toBe(t.want);
+      expect(unescape(marked(t.markdown))).toBe(t.want);
     }
   });
   test("parse plain link", () => {
@@ -83,7 +84,7 @@ console.log("hello world!")
     ];
 
     for (const t of tests) {
-      expect(marked(t.markdown)).toBe(t.want);
+      expect(unescape(marked(t.markdown))).toBe(t.want);
     }
   });
   test("parse inline code", () => {
@@ -95,7 +96,7 @@ console.log("hello world!")
     ];
 
     for (const t of tests) {
-      expect(marked(t.markdown)).toBe(t.want);
+      expect(unescape(marked(t.markdown))).toBe(t.want);
     }
   });
   test("parse bold and em text", () => {
@@ -119,7 +120,7 @@ console.log("hello world!")
     ];
 
     for (const t of tests) {
-      expect(marked(t.markdown)).toBe(t.want);
+      expect(unescape(marked(t.markdown))).toBe(t.want);
     }
   });
 });
diff --git a/web/src/services/userService.ts b/web/src/services/userService.ts
index 4ed4acbd..68933eb2 100644
--- a/web/src/services/userService.ts
+++ b/web/src/services/userService.ts
@@ -1,4 +1,3 @@
-import { isUndefined } from "lodash-es";
 import { locationService } from ".";
 import * as api from "../helpers/api";
 import store from "../store";
@@ -58,7 +57,7 @@ const userService = {
   },
 
   isVisitorMode: () => {
-    return !isUndefined(userService.getUserIdFromPath());
+    return !(userService.getUserIdFromPath() === undefined);
   },
 
   getUserIdFromPath: () => {
diff --git a/web/yarn.lock b/web/yarn.lock
index 33f1d157..b16ebd61 100644
--- a/web/yarn.lock
+++ b/web/yarn.lock
@@ -2927,6 +2927,11 @@ lodash.merge@^4.6.2:
   resolved "https://registry.yarnpkg.com/lodash.merge/-/lodash.merge-4.6.2.tgz#558aa53b43b661e1925a0afdfa36a9a1085fe57a"
   integrity sha512-0KpjqXRVvrYyCsX1swR/XTK0va6VQkQM6MNo7PqW77ByjAhoARA8EfrP1N4+KlKj8YS0ZUCtRT/YUuhyYDujIQ==
 
+lodash@^4.17.21:
+  version "4.17.21"
+  resolved "https://registry.yarnpkg.com/lodash/-/lodash-4.17.21.tgz#679591c564c3bffaae8454cf0b3df370c3d6911c"
+  integrity sha512-v2kDEe57lecTulaDIuNTPy3Ry4gLGJ6Z1O3vE1krgXZNrsQ+LFTGHVxVjcXPs17LhbZVGedAJv8XZ1tvj5FvSg==
+
 loose-envify@^1.1.0, loose-envify@^1.4.0:
   version "1.4.0"
   resolved "https://registry.yarnpkg.com/loose-envify/-/loose-envify-1.4.0.tgz#71ee51fa7be4caec1a63839f7e682d8132d30caf"