diff --git a/src/App.tsx b/src/App.tsx
index 1f4a7b3..fa7b957 100644
--- a/src/App.tsx
+++ b/src/App.tsx
@@ -529,34 +529,6 @@ const TimelineSection = ({
     }
   };
 
-  const handleToggleBookmark = async (status: Status) => {
-    if (!account) {
-      onError("계정을 선택해주세요.");
-      return;
-    }
-    onError(null);
-    const isBookmarking = !status.bookmarked;
-    const optimistic = {
-      ...status,
-      bookmarked: isBookmarking
-    };
-    timeline.updateItem(optimistic);
-    try {
-      const updated = status.bookmarked
-        ? await services.api.unbookmark(account, status.id)
-        : await services.api.bookmark(account, status.id);
-      timeline.updateItem(updated);
-      if (isBookmarking) {
-        showToast("북마크했습니다.");
-      } else {
-        showToast("북마크를 취소했습니다.");
-      }
-    } catch (err) {
-      onError(err instanceof Error ? err.message : "북마크 처리에 실패했습니다.");
-      timeline.updateItem(status);
-    }
-  };
-
   const handleReact = useCallback(
     (status: Status, reaction: ReactionInput) => {
       onReact(account, status, reaction);
@@ -706,9 +678,8 @@ const TimelineSection = ({
                              onReply={(item) => onReply(item, account)}
                              onStatusClick={(status) => onStatusClick(status, account)}
                              onToggleFavourite={handleToggleFavourite}
-                             onToggleReblog={handleToggleReblog}
-                             onToggleBookmark={handleToggleBookmark}
-                             onDelete={handleDeleteStatus}
+                            onToggleReblog={handleToggleReblog}
+                            onDelete={handleDeleteStatus}
                             onReact={handleReact}
                             onProfileClick={(item) => onProfileClick(item, account)}
                             activeHandle={
@@ -839,9 +810,8 @@ const TimelineSection = ({
                  onReply={(item) => onReply(item, account)}
                  onStatusClick={(status) => onStatusClick(status, account)}
                  onToggleFavourite={handleToggleFavourite}
-                 onToggleReblog={handleToggleReblog}
-                 onToggleBookmark={handleToggleBookmark}
-                 onDelete={handleDeleteStatus}
+                onToggleReblog={handleToggleReblog}
+                onDelete={handleDeleteStatus}
                 onReact={handleReact}
                 onProfileClick={(item) => onProfileClick(item, account)}
                 activeHandle={
@@ -2097,27 +2067,6 @@ onAccountChange={setSectionAccount}
               setActionError(err instanceof Error ? err.message : "부스트 처리에 실패했습니다.");
             }
           }}
-          onToggleBookmark={async (status) => {
-            if (!composeAccount) {
-              setActionError("계정을 선택해주세요.");
-              return;
-            }
-            setActionError(null);
-            const isBookmarking = !status.bookmarked;
-            try {
-              const updated = status.bookmarked
-                ? await services.api.unbookmark(composeAccount, status.id)
-                : await services.api.bookmark(composeAccount, status.id);
-              setSelectedStatus(updated);
-              if (isBookmarking) {
-                showToast("북마크했습니다.");
-              } else {
-                showToast("북마크를 취소했습니다.");
-              }
-            } catch (err) {
-              setActionError(err instanceof Error ? err.message : "북마크 처리에 실패했습니다.");
-            }
-          }}
           onDelete={async (status) => {
             if (!composeAccount) {
               return;
diff --git a/src/domain/types.ts b/src/domain/types.ts
index c36276f..6eee19a 100644
--- a/src/domain/types.ts
+++ b/src/domain/types.ts
@@ -94,7 +94,6 @@ export type Status = {
   reactions: Reaction[];
   reblogged: boolean;
   favourited: boolean;
-  bookmarked: boolean;
   inReplyToId: string | null;
   mentions: Mention[];
   mediaAttachments: MediaAttachment[];
diff --git a/src/infra/MastodonHttpClient.ts b/src/infra/MastodonHttpClient.ts
index 807f329..bb141e0 100644
--- a/src/infra/MastodonHttpClient.ts
+++ b/src/infra/MastodonHttpClient.ts
@@ -283,10 +283,6 @@ export class MastodonHttpClient implements MastodonApi {
     return mapAccountRelationship(data);
   }
 
-  async fetchThreadContext(account: Account, statusId: string): Promise<ThreadContext> {
-    return this.fetchContext(account, statusId);
-  }
-
   async fetchAccountStatuses(
     account: Account,
     accountId: string,
@@ -390,14 +386,6 @@ export class MastodonHttpClient implements MastodonApi {
     return this.postAction(account, statusId, "unfavourite");
   }
 
-  async bookmark(account: Account, statusId: string): Promise<Status> {
-    return this.postAction(account, statusId, "bookmark");
-  }
-
-  async unbookmark(account: Account, statusId: string): Promise<Status> {
-    return this.postAction(account, statusId, "unbookmark");
-  }
-
   async createReaction(_account: Account, _statusId: string, _reaction: string): Promise<Status> {
     throw new Error("리액션은 미스키 계정에서만 사용할 수 있습니다.");
   }
diff --git a/src/infra/UnifiedApiClient.ts b/src/infra/UnifiedApiClient.ts
index c6139df..df9d50e 100644
--- a/src/infra/UnifiedApiClient.ts
+++ b/src/infra/UnifiedApiClient.ts
@@ -95,14 +95,6 @@ export class UnifiedApiClient implements MastodonApi {
     return this.getClient(account).unfavourite(account, statusId);
   }
 
-  bookmark(account: Account, statusId: string) {
-    return this.getClient(account).bookmark(account, statusId);
-  }
-
-  unbookmark(account: Account, statusId: string) {
-    return this.getClient(account).unbookmark(account, statusId);
-  }
-
   createReaction(account: Account, statusId: string, reaction: string) {
     return this.getClient(account).createReaction(account, statusId, reaction);
   }
diff --git a/src/infra/mastodonMapper.ts b/src/infra/mastodonMapper.ts
index ba315be..19168f6 100644
--- a/src/infra/mastodonMapper.ts
+++ b/src/infra/mastodonMapper.ts
@@ -259,7 +259,6 @@ export const mapStatus = (raw: unknown): Status => {
     reactions,
     reblogged: Boolean(value.reblogged ?? false),
     favourited: Boolean(value.favourited ?? false),
-    bookmarked: Boolean(value.bookmarked ?? false),
     inReplyToId: value.in_reply_to_id ? String(value.in_reply_to_id) : null,
     mentions: mapMentions(value.mentions),
     mediaAttachments: mapMediaAttachments(value.media_attachments),
@@ -328,8 +327,6 @@ export const mapNotificationToStatus = (raw: unknown): Status | null => {
     accountUrl,
     accountAvatarUrl,
     content,
-    htmlContent: "",
-    hasRichContent: false,
     url: target?.url ?? null,
     visibility: target?.visibility ?? "public",
     spoilerText: "",
@@ -341,7 +338,6 @@ export const mapNotificationToStatus = (raw: unknown): Status | null => {
     reactions: [],
     reblogged: false,
     favourited: false,
-    bookmarked: false,
     inReplyToId: target?.inReplyToId ?? null,
     mentions: [],
     mediaAttachments: target?.mediaAttachments ?? [],
diff --git a/src/services/MastodonApi.ts b/src/services/MastodonApi.ts
index ccb56a3..c181188 100644
--- a/src/services/MastodonApi.ts
+++ b/src/services/MastodonApi.ts
@@ -1,4 +1,4 @@
-import type { Account, AccountRelationship, Status, TimelineType, Visibility, InstanceInfo, UserProfile, ThreadContext } from "../domain/types";
+import type { Account, AccountRelationship, Status, TimelineType, Visibility, InstanceInfo, UserProfile } from "../domain/types";
 import type { CustomEmoji } from "../domain/types";
 
 export type CreateStatusInput = {
@@ -21,8 +21,6 @@ export interface MastodonApi {
   deleteStatus(account: Account, statusId: string): Promise<void>;
   favourite(account: Account, statusId: string): Promise<Status>;
   unfavourite(account: Account, statusId: string): Promise<Status>;
-  bookmark(account: Account, statusId: string): Promise<Status>;
-  unbookmark(account: Account, statusId: string): Promise<Status>;
   createReaction(account: Account, statusId: string, reaction: string): Promise<Status>;
   deleteReaction(account: Account, statusId: string): Promise<Status>;
   reblog(account: Account, statusId: string): Promise<Status>;
@@ -38,5 +36,4 @@ export interface MastodonApi {
   blockAccount(account: Account, accountId: string): Promise<AccountRelationship>;
   unblockAccount(account: Account, accountId: string): Promise<AccountRelationship>;
   fetchAccountStatuses(account: Account, accountId: string, limit: number, maxId?: string): Promise<Status[]>;
-  fetchThreadContext(account: Account, statusId: string): Promise<ThreadContext>;
 }
diff --git a/src/ui/components/ProfileModal.tsx b/src/ui/components/ProfileModal.tsx
index f65c606..d77a481 100644
--- a/src/ui/components/ProfileModal.tsx
+++ b/src/ui/components/ProfileModal.tsx
@@ -365,27 +365,6 @@ export const ProfileModal = ({
     [account, api, updateItem]
   );
 
-  const handleToggleBookmark = useCallback(
-    async (target: Status) => {
-      if (!account) {
-        setItemsError("계정을 선택해 주세요.");
-        return;
-      }
-      setItemsError(null);
-      const isBookmarking = !target.bookmarked;
-      try {
-        const updated = target.bookmarked
-          ? await api.unbookmark(account, target.id)
-          : await api.bookmark(account, target.id);
-        updateItem(updated);
-        showToast(isBookmarking ? "북마크했습니다." : "북마크를 취소했습니다.");
-      } catch (error) {
-        setItemsError(error instanceof Error ? error.message : "북마크 처리에 실패했습니다.");
-      }
-    },
-    [account, api, updateItem, showToast]
-  );
-
   const handleDeleteStatus = useCallback(
     async (target: Status) => {
       if (!account) {
@@ -980,10 +959,9 @@ export const ProfileModal = ({
                   key={item.id}
                   status={item}
                   onReply={(target) => onReply(target, account)}
-                   onToggleFavourite={handleToggleFavourite}
-                   onToggleReblog={handleToggleReblog}
-                   onToggleBookmark={handleToggleBookmark}
-                   onDelete={handleDeleteStatus}
+                  onToggleFavourite={handleToggleFavourite}
+                  onToggleReblog={handleToggleReblog}
+                  onDelete={handleDeleteStatus}
                   onReact={handleReact}
                   onStatusClick={onStatusClick}
                   onProfileClick={(target) => onProfileClick(target, account)}
diff --git a/src/ui/components/StatusModal.tsx b/src/ui/components/StatusModal.tsx
index 3c28f00..d65a77f 100644
--- a/src/ui/components/StatusModal.tsx
+++ b/src/ui/components/StatusModal.tsx
@@ -15,7 +15,6 @@ export const StatusModal = ({
   onReply,
   onToggleFavourite,
   onToggleReblog,
-  onToggleBookmark,
   onDelete,
   onProfileClick,
   activeHandle,
@@ -34,7 +33,6 @@ export const StatusModal = ({
   onReply: (status: Status) => void;
   onToggleFavourite: (status: Status) => void;
   onToggleReblog: (status: Status) => void;
-  onToggleBookmark: (status: Status) => void;
   onDelete?: (status: Status) => void;
   onProfileClick?: (status: Status, account: Account | null) => void;
   activeHandle: string;
@@ -196,13 +194,12 @@ export const StatusModal = ({
             <div className="thread-context thread-ancestors">
               {threadContext.ancestors.map((ancestorStatus) => (
                 <div key={ancestorStatus.id} className="thread-item thread-ancestor">
-                   <TimelineItem
-                     status={ancestorStatus}
-                     onReply={onReply}
-                     onToggleFavourite={onToggleFavourite}
-                     onToggleReblog={onToggleReblog}
-                     onToggleBookmark={onToggleBookmark}
-                     onDelete={onDelete || (() => {})}
+                  <TimelineItem
+                    status={ancestorStatus}
+                    onReply={onReply}
+                    onToggleFavourite={onToggleFavourite}
+                    onToggleReblog={onToggleReblog}
+                    onDelete={onDelete || (() => {})}
                     onProfileClick={handleProfileClick}
                     activeHandle={activeHandle}
                     activeAccountHandle={activeAccountHandle}
@@ -232,7 +229,6 @@ export const StatusModal = ({
             onReply={onReply}
             onToggleFavourite={onToggleFavourite}
             onToggleReblog={onToggleReblog}
-            onToggleBookmark={onToggleBookmark}
             onDelete={onDelete || (() => {})}
             onProfileClick={handleProfileClick}
             activeHandle={activeHandle}
@@ -262,7 +258,6 @@ export const StatusModal = ({
                     onReply={onReply}
                     onToggleFavourite={onToggleFavourite}
                     onToggleReblog={onToggleReblog}
-                    onToggleBookmark={onToggleBookmark}
                     onDelete={onDelete || (() => {})}
                     onProfileClick={handleProfileClick}
                     activeHandle={activeHandle}
diff --git a/src/ui/components/TimelineItem.tsx b/src/ui/components/TimelineItem.tsx
index 773de1d..f21915f 100644
--- a/src/ui/components/TimelineItem.tsx
+++ b/src/ui/components/TimelineItem.tsx
@@ -2,7 +2,7 @@ import React, { useCallback, useEffect, useMemo, useRef, useState } from "react"
 import type { Account, CustomEmoji, Mention, ReactionInput, Status } from "../../domain/types";
 import type { MastodonApi } from "../../services/MastodonApi";
 import { sanitizeHtml } from "../utils/htmlSanitizer";
-import { renderTextWithLinks, type MentionLink } from "../utils/linkify";
+import { renderTextWithLinks } from "../utils/linkify";
 import BoostIcon from "../assets/boost-icon.svg?react";
 import ReplyIcon from "../assets/reply-icon.svg?react";
 import TrashIcon from "../assets/trash-icon.svg?react";
@@ -30,7 +30,6 @@ export const TimelineItem = ({
   onToggleFavourite,
   onToggleReblog,
   onDelete,
-  onToggleBookmark,
   onReact,
   onProfileClick,
   onStatusClick,
@@ -50,7 +49,6 @@ export const TimelineItem = ({
   onToggleFavourite: (status: Status) => void;
   onToggleReblog: (status: Status) => void;
   onDelete: (status: Status) => void;
-  onToggleBookmark: (status: Status) => void;
   onReact?: (status: Status, reaction: ReactionInput) => void;
   onProfileClick?: (status: Status) => void;
   onStatusClick?: (status: Status) => void;
@@ -475,7 +473,6 @@ export const TimelineItem = ({
       reactions: [],
       reblogged: false,
       favourited: false,
-      bookmarked: false,
       inReplyToId: null,
       mentions: [],
       mediaAttachments: [],
@@ -489,11 +486,11 @@ export const TimelineItem = ({
     [displayStatus.createdAt, displayStatus.id]
   );
   const handleMentionClick = useCallback(
-    (mention: MentionLink) => {
+    (mention: Mention) => {
       if (!onProfileClick || !mention.id) {
         return;
       }
-      onProfileClick(buildMentionStatus(mention as Mention));
+      onProfileClick(buildMentionStatus(mention));
     },
     [buildMentionStatus, onProfileClick]
   );
@@ -864,15 +861,6 @@ export const TimelineItem = ({
             <>
               <div className="overlay-backdrop" aria-hidden="true" />
               <div ref={menuRef} className="section-menu-panel status-menu-panel" role="menu">
-                <button 
-                  type="button" 
-                  onClick={() => {
-                    onToggleBookmark(displayStatus);
-                    setMenuOpen(false);
-                  }}
-                >
-                  {displayStatus.bookmarked ? "북마크 취소" : "북마크"}
-                </button>
                 <button type="button" onClick={handleOpenOrigin} disabled={!originUrl}>
                   원본 서버에서 보기
                 </button>