diff --git a/apps/readest-app/src/app/library/page.tsx b/apps/readest-app/src/app/library/page.tsx
index e461d2dd..060f46ef 100644
--- a/apps/readest-app/src/app/library/page.tsx
+++ b/apps/readest-app/src/app/library/page.tsx
@@ -34,6 +34,7 @@ import { useTheme } from '@/hooks/useTheme';
 import { useUICSS } from '@/hooks/useUICSS';
 import { useDemoBooks } from './hooks/useDemoBooks';
 import { useBooksSync } from './hooks/useBooksSync';
+import { useBookDataStore } from '@/store/bookDataStore';
 import { useScreenWakeLock } from '@/hooks/useScreenWakeLock';
 import { useOpenWithBooks } from '@/hooks/useOpenWithBooks';
 import { SelectedFile, useFileSelector } from '@/hooks/useFileSelector';
@@ -87,6 +88,7 @@ const LibraryPageContent = ({ searchParams }: { searchParams: ReadonlyURLSearchP
   const _ = useTranslation();
   const { selectFiles } = useFileSelector(appService, _);
   const { safeAreaInsets: insets, isRoundedWindow } = useThemeStore();
+  const { clearBookData } = useBookDataStore();
   const { settings, setSettings, saveSettings } = useSettingsStore();
   const { isSettingsDialogOpen, setSettingsDialogOpen } = useSettingsStore();
   const [showCatalogManager, setShowCatalogManager] = useState(false);
@@ -531,6 +533,7 @@ const LibraryPageContent = ({ searchParams }: { searchParams: ReadonlyURLSearchP
       try {
         await appService?.deleteBook(book, deleteAction);
         await updateBook(envConfig, book);
+        clearBookData(book.hash);
         if (syncBooks) pushLibrary();
         eventDispatcher.dispatch('toast', {
           type: 'info',
diff --git a/apps/readest-app/src/components/metadata/BookDetailModal.tsx b/apps/readest-app/src/components/metadata/BookDetailModal.tsx
index 60e67ac1..64a3718a 100644
--- a/apps/readest-app/src/components/metadata/BookDetailModal.tsx
+++ b/apps/readest-app/src/components/metadata/BookDetailModal.tsx
@@ -5,7 +5,6 @@ import { Book } from '@/types/book';
 import { BookMetadata } from '@/libs/document';
 import { useEnv } from '@/context/EnvContext';
 import { useThemeStore } from '@/store/themeStore';
-import { useSettingsStore } from '@/store/settingsStore';
 import { useTranslation } from '@/hooks/useTranslation';
 import { useMetadataEdit } from './useMetadataEdit';
 import { DeleteAction } from '@/types/system';
@@ -46,14 +45,13 @@ const BookDetailModal: React.FC<BookDetailModalProps> = ({
   handleBookMetadataUpdate,
 }) => {
   const _ = useTranslation();
+  const { envConfig } = useEnv();
   const { safeAreaInsets } = useThemeStore();
   const [loading, setLoading] = useState(false);
   const [activeDeleteAction, setActiveDeleteAction] = useState<DeleteAction | null>(null);
   const [editMode, setEditMode] = useState(false);
   const [bookMeta, setBookMeta] = useState<BookMetadata | null>(null);
   const [fileSize, setFileSize] = useState<number | null>(null);
-  const { envConfig } = useEnv();
-  const { settings } = useSettingsStore();
 
   // Initialize metadata edit hook
   const {
@@ -97,7 +95,7 @@ const BookDetailModal: React.FC<BookDetailModalProps> = ({
     const fetchBookDetails = async () => {
       const appService = await envConfig.getAppService();
       try {
-        const details = book.metadata || (await appService.fetchBookDetails(book, settings));
+        const details = book.metadata || (await appService.fetchBookDetails(book));
         setBookMeta(details);
         const size = await appService.getBookFileSize(book);
         setFileSize(size);
diff --git a/apps/readest-app/src/components/settings/LangPanel.tsx b/apps/readest-app/src/components/settings/LangPanel.tsx
index e1fca07d..f65c111d 100644
--- a/apps/readest-app/src/components/settings/LangPanel.tsx
+++ b/apps/readest-app/src/components/settings/LangPanel.tsx
@@ -19,7 +19,8 @@ const LangPanel: React.FC<SettingsPanelPanelProp> = ({ bookKey, onRegisterReset
   const { token } = useAuth();
   const { envConfig } = useEnv();
   const { settings, applyUILanguage } = useSettingsStore();
-  const { getViewSettings, setViewSettings, recreateViewer } = useReaderStore();
+  const { getView, getViewSettings, setViewSettings, recreateViewer } = useReaderStore();
+  const view = getView(bookKey);
   const viewSettings = getViewSettings(bookKey) || settings.globalViewSettings;
 
   const [uiLanguage, setUILanguage] = useState(viewSettings.uiLanguage);
@@ -191,7 +192,7 @@ const LangPanel: React.FC<SettingsPanelPanelProp> = ({ bookKey, onRegisterReset
       bookKey,
       'replaceQuotationMarks',
       replaceQuotationMarks,
-      true,
+      false,
       false,
     ).then(() => {
       recreateViewer(envConfig, bookKey);
@@ -231,7 +232,7 @@ const LangPanel: React.FC<SettingsPanelPanelProp> = ({ bookKey, onRegisterReset
       bookKey,
       'convertChineseVariant',
       convertChineseVariant,
-      true,
+      false,
       false,
     ).then(() => {
       recreateViewer(envConfig, bookKey);
@@ -268,6 +269,7 @@ const LangPanel: React.FC<SettingsPanelPanelProp> = ({ bookKey, onRegisterReset
                 className='toggle'
                 checked={translationEnabled}
                 onChange={() => setTranslationEnabled(!translationEnabled)}
+                disabled={!bookKey}
               />
             </div>
 
@@ -311,7 +313,7 @@ const LangPanel: React.FC<SettingsPanelPanelProp> = ({ bookKey, onRegisterReset
         </div>
       </div>
 
-      {isCJKEnv() && (
+      {(isCJKEnv() || view?.language.isCJK) && (
         <div className='w-full'>
           <h2 className='mb-2 font-medium'>{_('Punctuation')}</h2>
           <div className='card border-base-200 bg-base-100 border shadow'>
@@ -333,7 +335,7 @@ const LangPanel: React.FC<SettingsPanelPanelProp> = ({ bookKey, onRegisterReset
         </div>
       )}
 
-      {isCJKEnv() && (
+      {(isCJKEnv() || view?.language.isCJK) && (
         <div className='w-full'>
           <h2 className='mb-2 font-medium'>{_('Convert Simplified and Traditional Chinese')}</h2>
           <div className='card border-base-200 bg-base-100 border shadow'>
diff --git a/apps/readest-app/src/services/appService.ts b/apps/readest-app/src/services/appService.ts
index 8e569e21..bb99cad8 100644
--- a/apps/readest-app/src/services/appService.ts
+++ b/apps/readest-app/src/services/appService.ts
@@ -668,7 +668,7 @@ export abstract class BaseAppService implements AppService {
     return null;
   }
 
-  async loadBookContent(book: Book, settings: SystemSettings): Promise<BookContent> {
+  async loadBookContent(book: Book): Promise<BookContent> {
     let file: File;
     const fp = getLocalBookFilename(book);
     if (await this.fs.exists(fp, 'Books')) {
@@ -692,7 +692,7 @@ export abstract class BaseAppService implements AppService {
         throw new Error(BOOK_FILE_NOT_FOUND_ERROR);
       }
     }
-    return { book, file, config: await this.loadBookConfig(book, settings) };
+    return { book, file };
   }
 
   async loadBookConfig(book: Book, settings: SystemSettings): Promise<BookConfig> {
@@ -711,13 +711,13 @@ export abstract class BaseAppService implements AppService {
     }
   }
 
-  async fetchBookDetails(book: Book, settings: SystemSettings) {
+  async fetchBookDetails(book: Book) {
     const fp = getLocalBookFilename(book);
     if (!(await this.fs.exists(fp, 'Books')) && book.uploadedAt) {
       await this.downloadBook(book);
     }
-    const { file } = (await this.loadBookContent(book, settings)) as BookContent;
-    const bookDoc = (await new DocumentLoader(file).open()).book as BookDoc;
+    const { file } = await this.loadBookContent(book);
+    const bookDoc = (await new DocumentLoader(file).open()).book;
     const f = file as ClosableFile;
     if (f && f.close) {
       await f.close();
diff --git a/apps/readest-app/src/store/bookDataStore.ts b/apps/readest-app/src/store/bookDataStore.ts
index 03b77d4b..85a93e02 100644
--- a/apps/readest-app/src/store/bookDataStore.ts
+++ b/apps/readest-app/src/store/bookDataStore.ts
@@ -27,6 +27,7 @@ interface BookDataState {
   ) => void;
   updateBooknotes: (key: string, booknotes: BookNote[]) => BookConfig | undefined;
   getBookData: (keyOrId: string) => BookData | null;
+  clearBookData: (keyOrId: string) => void;
 }
 
 export const useBookDataStore = create<BookDataState>((set, get) => ({
@@ -35,6 +36,16 @@ export const useBookDataStore = create<BookDataState>((set, get) => ({
     const id = keyOrId.split('-')[0]!;
     return get().booksData[id] || null;
   },
+  clearBookData: (keyOrId: string) => {
+    const id = keyOrId.split('-')[0]!;
+    set((state) => {
+      const newBooksData = { ...state.booksData };
+      delete newBooksData[id];
+      return {
+        booksData: newBooksData,
+      };
+    });
+  },
   getConfig: (key: string | null) => {
     if (!key) return null;
     const id = key.split('-')[0]!;
diff --git a/apps/readest-app/src/store/readerStore.ts b/apps/readest-app/src/store/readerStore.ts
index e5f06c33..6a177bcd 100644
--- a/apps/readest-app/src/store/readerStore.ts
+++ b/apps/readest-app/src/store/readerStore.ts
@@ -144,51 +144,53 @@ export const useReaderStore = create<ReaderStore>((set, get) => ({
       },
     }));
     try {
+      const appService = await envConfig.getAppService();
       const { settings } = useSettingsStore.getState();
-      if (!bookData || reload) {
-        const appService = await envConfig.getAppService();
-        const { library } = useLibraryStore.getState();
-        const book = library.find((b) => b.hash === id);
-        if (!book) {
-          throw new Error('Book not found');
-        }
-        const content = (await appService.loadBookContent(book, settings)) as BookContent;
-        const { file, config } = content;
-        console.log('Loading book', key);
-        const { book: bookDoc } = await new DocumentLoader(file).open();
-        await updateToc(
-          bookDoc,
-          config.viewSettings?.sortedTOC ?? false,
-          config.viewSettings?.convertChineseVariant ?? 'none',
-        );
-        if (!bookDoc.metadata.title) {
-          bookDoc.metadata.title = getBaseFilename(file.name);
-        }
-        book.sourceTitle = formatTitle(bookDoc.metadata.title);
-        // Correct language codes mistakenly set with language names
-        if (typeof bookDoc.metadata?.language === 'string') {
-          if (bookDoc.metadata.language in SUPPORTED_LANGNAMES) {
-            bookDoc.metadata.language = SUPPORTED_LANGNAMES[bookDoc.metadata.language]!;
-          }
-        }
-        // Set the book's language for formerly imported books, newly imported books have this field set
-        const primaryLanguage = getPrimaryLanguage(bookDoc.metadata.language);
-        book.primaryLanguage = book.primaryLanguage ?? primaryLanguage;
-        book.metadata = book.metadata ?? bookDoc.metadata;
-        // TODO: uncomment this when we can ensure metaHash is correctly generated for all books
-        // book.metaHash = book.metaHash ?? getMetadataHash(bookDoc.metadata);
-        book.metaHash = getMetadataHash(bookDoc.metadata);
-
-        const isFixedLayout = FIXED_LAYOUT_FORMATS.has(book.format);
-        useBookDataStore.setState((state) => ({
-          booksData: {
-            ...state.booksData,
-            [id]: { id, book, file, config, bookDoc, isFixedLayout },
-          },
-        }));
+      const { library } = useLibraryStore.getState();
+      const book = library.find((b) => b.hash === id);
+      if (!book) {
+        throw new Error('Book not found');
       }
-      const booksData = useBookDataStore.getState().booksData;
-      const config = booksData[id]?.config as BookConfig;
+      let bookDoc = bookData?.bookDoc;
+      let file = bookData?.file;
+      if (!bookDoc || !file || reload) {
+        const content = (await appService.loadBookContent(book)) as BookContent;
+        file = content.file;
+        console.log('Loading book', key);
+        const doc = await new DocumentLoader(file).open();
+        bookDoc = doc.book;
+      }
+      const config = await appService.loadBookConfig(book, settings);
+      await updateToc(
+        bookDoc,
+        config.viewSettings?.sortedTOC ?? false,
+        config.viewSettings?.convertChineseVariant ?? 'none',
+      );
+      if (!bookDoc.metadata.title) {
+        bookDoc.metadata.title = getBaseFilename(file.name);
+      }
+      book.sourceTitle = formatTitle(bookDoc.metadata.title);
+      // Correct language codes mistakenly set with language names
+      if (typeof bookDoc.metadata?.language === 'string') {
+        if (bookDoc.metadata.language in SUPPORTED_LANGNAMES) {
+          bookDoc.metadata.language = SUPPORTED_LANGNAMES[bookDoc.metadata.language]!;
+        }
+      }
+      // Set the book's language for formerly imported books, newly imported books have this field set
+      const primaryLanguage = getPrimaryLanguage(bookDoc.metadata.language);
+      book.primaryLanguage = book.primaryLanguage ?? primaryLanguage;
+      book.metadata = book.metadata ?? bookDoc.metadata;
+      // TODO: uncomment this when we can ensure metaHash is correctly generated for all books
+      // book.metaHash = book.metaHash ?? getMetadataHash(bookDoc.metadata);
+      book.metaHash = getMetadataHash(bookDoc.metadata);
+
+      const isFixedLayout = FIXED_LAYOUT_FORMATS.has(book.format);
+      useBookDataStore.setState((state) => ({
+        booksData: {
+          ...state.booksData,
+          [id]: { id, book, file, config, bookDoc, isFixedLayout },
+        },
+      }));
       const configViewSettings = config.viewSettings!;
       const globalViewSettings = settings.globalViewSettings;
       set((state) => ({
diff --git a/apps/readest-app/src/types/book.ts b/apps/readest-app/src/types/book.ts
index e384352d..4912e241 100644
--- a/apps/readest-app/src/types/book.ts
+++ b/apps/readest-app/src/types/book.ts
@@ -293,5 +293,4 @@ export interface BooksGroup {
 export interface BookContent {
   book: Book;
   file: File;
-  config: BookConfig;
 }
diff --git a/apps/readest-app/src/types/system.ts b/apps/readest-app/src/types/system.ts
index 9cd5e8ac..5677e45f 100644
--- a/apps/readest-app/src/types/system.ts
+++ b/apps/readest-app/src/types/system.ts
@@ -112,9 +112,9 @@ export interface AppService {
   isBookAvailable(book: Book): Promise<boolean>;
   getBookFileSize(book: Book): Promise<number | null>;
   loadBookConfig(book: Book, settings: SystemSettings): Promise<BookConfig>;
-  fetchBookDetails(book: Book, settings: SystemSettings): Promise<BookMetadata>;
+  fetchBookDetails(book: Book): Promise<BookMetadata>;
   saveBookConfig(book: Book, config: BookConfig, settings?: SystemSettings): Promise<void>;
-  loadBookContent(book: Book, settings: SystemSettings): Promise<BookContent>;
+  loadBookContent(book: Book): Promise<BookContent>;
   loadLibraryBooks(): Promise<Book[]>;
   saveLibraryBooks(books: Book[]): Promise<void>;
   getCoverImageUrl(book: Book): string;