diff --git a/wsai/backends/claude.py b/wsai/backends/claude.py
index acbf4c4..c6ca75f 100644
--- a/wsai/backends/claude.py
+++ b/wsai/backends/claude.py
@@ -24,6 +24,7 @@ import os
 import time
 
 from ..interfaces import Frame, Reply, ScreenObservation
+from ..prompt_store import get_persona
 
 # Claude Code OAuth tokens only answer when the first system block is exactly
 # this identity string; the real persona/instructions go in later blocks.
@@ -148,10 +149,12 @@ class ClaudeBrain:
         screen_note = f"[지금 화면] {screen.text}\n\n" if screen else "[지금 화면] (아직 못 읽음)\n\n"
         msgs.append({"role": "user", "content": screen_note + user_text})
         client = self._auth.client()
+        # Read the persona live each turn so a dashboard edit applies immediately
+        # (falls back to the built-in PERSONA when no override is saved).
         resp = await client.messages.create(
             model=self.model,
             max_tokens=400,
-            system=self._auth.system(self.PERSONA),
+            system=self._auth.system(get_persona(self.PERSONA)),
             messages=msgs,
         )
         text = "".join(b.text for b in resp.content if b.type == "text")
diff --git a/wsai/dashboard.py b/wsai/dashboard.py
index 5476999..61bd437 100644
--- a/wsai/dashboard.py
+++ b/wsai/dashboard.py
@@ -58,6 +58,8 @@ def _make_handler(dash: "Dashboard"):
             elif path == "/api/state":
                 body = json.dumps(monitor.snapshot(), ensure_ascii=False).encode("utf-8")
                 self._send(200, body, "application/json; charset=utf-8")
+            elif path == "/api/prompt":
+                self._handle_prompt_get()
             elif path == "/events":
                 self._stream_events()
             else:
@@ -69,6 +71,8 @@ def _make_handler(dash: "Dashboard"):
                 self._handle_stt()
             elif path == "/api/voice-turn":
                 self._handle_voice_turn()
+            elif path == "/api/prompt":
+                self._handle_prompt_post()
             else:
                 self._send(404, b"not found", "text/plain; charset=utf-8")
 
@@ -138,6 +142,49 @@ def _make_handler(dash: "Dashboard"):
                                   ensure_ascii=False).encode("utf-8")
                 self._send(500, body, "application/json; charset=utf-8")
 
+        def _default_persona(self) -> str:
+            # The built-in seed prompt, used when no override is saved. Imported
+            # lazily so the dashboard has no hard dependency on the Claude backend.
+            try:
+                from .backends.claude import ClaudeBrain
+                return ClaudeBrain.PERSONA
+            except Exception:
+                return ""
+
+        def _handle_prompt_get(self) -> None:
+            """Return the live bot system prompt so the page can show/edit it."""
+            from . import prompt_store
+            default = self._default_persona()
+            body = json.dumps({
+                "ok": True,
+                "prompt": prompt_store.get_persona(default),
+                "default": default,
+                "overridden": prompt_store.is_overridden(),
+            }, ensure_ascii=False).encode("utf-8")
+            self._send(200, body, "application/json; charset=utf-8")
+
+        def _handle_prompt_post(self) -> None:
+            """Save an edited system prompt; takes effect on the next reply. An
+            empty prompt clears the override and reverts to the built-in default."""
+            from . import prompt_store
+            raw = self._read_body()
+            try:
+                data = json.loads(raw.decode("utf-8")) if raw else {}
+                prompt = data.get("prompt", "")
+            except (ValueError, AttributeError):
+                self._send(400, json.dumps({"ok": False, "error": "invalid JSON"}).encode(),
+                           "application/json; charset=utf-8")
+                return
+            prompt_store.set_persona(prompt)
+            monitor.log("info", "봇 프롬프트가 수정되었습니다" if prompt.strip()
+                        else "봇 프롬프트가 기본값으로 초기화되었습니다")
+            body = json.dumps({
+                "ok": True,
+                "prompt": prompt_store.get_persona(self._default_persona()),
+                "overridden": prompt_store.is_overridden(),
+            }, ensure_ascii=False).encode("utf-8")
+            self._send(200, body, "application/json; charset=utf-8")
+
         def _stream_events(self) -> None:
             self.send_response(200)
             self.send_header("Content-Type", "text/event-stream; charset=utf-8")
@@ -456,6 +503,28 @@ PAGE = r"""<!DOCTYPE html>
   .sttres{margin-top:12px;font-size:15px;min-height:1px}
   .sttres .txt{color:var(--heard);font-weight:600;line-height:1.5}
   .sttres .meta{color:var(--muted);font-size:12px;margin-top:5px}
+  .hbtn{padding:6px 12px;font-size:12.5px}
+  /* Modal / popup (reused by 프롬프트, 화이트/블랙리스트 …) */
+  .modal{position:fixed;inset:0;z-index:20;background:rgba(4,7,11,.66);
+    display:flex;align-items:center;justify-content:center;padding:20px}
+  .modal-card{background:var(--panel);border:1px solid var(--line);border-radius:16px;
+    width:min(760px,100%);max-height:86vh;display:flex;flex-direction:column;overflow:hidden;
+    box-shadow:0 24px 60px rgba(0,0,0,.5)}
+  .modal-head{display:flex;align-items:center;gap:12px;padding:12px 16px;border-bottom:1px solid var(--line)}
+  .modal-title{font-size:14px;font-weight:650}
+  .modal-actions{margin-left:auto;display:flex;gap:8px}
+  .modal-body{padding:16px;overflow:auto}
+  .modal-body textarea{width:100%;min-height:340px;background:var(--panel2);color:var(--fg);
+    border:1px solid var(--line);border-radius:10px;padding:12px;font-size:13px;line-height:1.6;
+    font-family:inherit;resize:vertical}
+  .modal-body textarea[readonly]{color:var(--muted)}
+  .modal-note{color:var(--muted);font-size:12px;margin:0 0 10px}
+  .btn.primary{background:#16452c;border-color:#1f5236;color:#9ff0bd}
+  .btn.primary:hover{background:#1b5636}
+  .toast{position:fixed;bottom:20px;left:50%;transform:translateX(-50%);z-index:30;
+    background:var(--panel);border:1px solid var(--line);border-radius:10px;padding:10px 16px;
+    font-size:13px;box-shadow:0 10px 30px rgba(0,0,0,.4);opacity:0;transition:opacity .2s}
+  .toast.show{opacity:1}
 </style>
 </head>
 <body>
@@ -465,6 +534,7 @@ PAGE = r"""<!DOCTYPE html>
     <div class="sub">STT → 두뇌 → TTS 음성 루프를 단계별로 관찰</div>
   </div>
   <div class="pill"><span id="dot" class="dot off"></span><span id="listen">연결 대기</span></div>
+  <button id="promptBtn" class="btn hbtn">📝 프롬프트</button>
   <div class="stats">
     <div class="stat"><b id="s-turns">0</b><span>대화 수</span></div>
     <div class="stat"><b id="s-errors">0</b><span>오류</span></div>
@@ -492,6 +562,17 @@ PAGE = r"""<!DOCTYPE html>
     <div id="events"></div>
   </div>
 </main>
+<div id="modal" class="modal" style="display:none">
+  <div class="modal-card">
+    <div class="modal-head">
+      <button class="btn back" id="modalBack">← 뒤로</button>
+      <span class="modal-title" id="modalTitle"></span>
+      <span class="modal-actions" id="modalActions"></span>
+    </div>
+    <div class="modal-body" id="modalBody"></div>
+  </div>
+</div>
+<div id="toast" class="toast"></div>
 <script>
 const $ = (id)=>document.getElementById(id);
 const turns = new Map();   // id -> turn object
@@ -665,6 +746,48 @@ async function sendBlob(blob){
   };
 })();
 
+// --- Reusable popup/modal (프롬프트, 화이트/블랙리스트 등이 공유) ---------- #
+function openModal(title, actionsHtml){
+  $('modalTitle').textContent = title;
+  $('modalActions').innerHTML = actionsHtml || '';
+  $('modal').style.display = 'flex';
+}
+function closeModal(){ $('modal').style.display='none'; $('modalBody').innerHTML=''; $('modalActions').innerHTML=''; }
+$('modalBack').onclick = closeModal;
+$('modal').addEventListener('click', (e)=>{ if(e.target===$('modal')) closeModal(); });
+document.addEventListener('keydown', (e)=>{ if(e.key==='Escape' && $('modal').style.display==='flex') closeModal(); });
+let toastTimer=null;
+function toast(msg){
+  const t=$('toast'); t.textContent=msg; t.classList.add('show');
+  clearTimeout(toastTimer); toastTimer=setTimeout(()=>t.classList.remove('show'), 2200);
+}
+
+// --- 프롬프트: 현재 시스템 프롬프트 보기/수정/저장 ------------------------- #
+async function openPrompt(){
+  openModal('봇 프롬프트', '<button class="btn" id="pEdit">수정</button>'
+    + '<button class="btn primary" id="pSave" style="display:none">저장</button>');
+  $('modalBody').innerHTML = '<p class="modal-note" id="pNote">현재 봇의 시스템 프롬프트입니다. 저장하면 다음 답변부터 즉시 적용됩니다. (빈칸 저장 시 기본값 복원)</p>'
+    + '<textarea id="pText" readonly>불러오는 중…</textarea>';
+  let data={};
+  try{ data=await (await fetch('/api/prompt')).json(); }catch(e){ $('pText').value='불러오기 실패: '+e; return; }
+  $('pText').value = data.prompt || '';
+  $('pNote').textContent = (data.overridden ? '현재 사용자 지정 프롬프트가 적용 중입니다. ' : '현재 기본 프롬프트가 적용 중입니다. ')
+    + '저장하면 다음 답변부터 즉시 적용됩니다. (빈칸 저장 시 기본값 복원)';
+  $('pEdit').onclick = ()=>{ $('pText').removeAttribute('readonly'); $('pText').focus(); $('pEdit').style.display='none'; $('pSave').style.display='inline-block'; };
+  $('pSave').onclick = async ()=>{
+    $('pSave').disabled=true;
+    try{
+      const r=await fetch('/api/prompt',{method:'POST',headers:{'Content-Type':'application/json'},
+        body:JSON.stringify({prompt:$('pText').value})});
+      const j=await r.json();
+      if(j.ok){ toast('프롬프트 저장됨 · 다음 답변부터 적용'); closeModal(); }
+      else { toast('저장 실패: '+(j.error||'')); }
+    }catch(e){ toast('저장 실패: '+e); }
+    finally{ $('pSave').disabled=false; }
+  };
+}
+$('promptBtn').onclick = openPrompt;
+
 connect();
 // Refresh uptime label every second from the last known status.
 setInterval(()=>{ if(statusData){ statusData.uptime_s=(statusData.uptime_s||0)+1; $('s-up').textContent=fmtUptime(statusData.uptime_s);} }, 1000);
diff --git a/wsai/prompt_store.py b/wsai/prompt_store.py
new file mode 100644
index 0000000..4186141
--- /dev/null
+++ b/wsai/prompt_store.py
@@ -0,0 +1,54 @@
+"""Persisted, live-editable bot persona (the brain's system prompt).
+
+The dashboard lets the user view and edit the bot's system prompt at runtime.
+The brain reads the current persona on every turn, so an edit takes effect on
+the next reply with no restart. The text is persisted to disk so it survives a
+restart; when no override file exists the caller's default
+(``ClaudeBrain.PERSONA``) is used.
+
+Path: ``$WSAI_PROMPT_PATH`` or ``~/.config/wsai/persona.txt`` (disk, never a
+RAM-backed tmpfs).
+"""
+
+from __future__ import annotations
+
+import os
+import threading
+from pathlib import Path
+
+_LOCK = threading.Lock()
+
+
+def _path() -> Path:
+    override = os.environ.get("WSAI_PROMPT_PATH")
+    return Path(override) if override else (Path.home() / ".config" / "wsai" / "persona.txt")
+
+
+def get_persona(default: str) -> str:
+    """Return the saved persona override, or ``default`` if none is set."""
+    try:
+        with _LOCK:
+            text = _path().read_text(encoding="utf-8")
+    except OSError:
+        return default
+    return text if text.strip() else default
+
+
+def set_persona(text: str) -> None:
+    """Persist a new persona. Blank text clears the override (reverts to default)."""
+    p = _path()
+    with _LOCK:
+        p.parent.mkdir(parents=True, exist_ok=True)
+        if text and text.strip():
+            p.write_text(text, encoding="utf-8")
+        else:
+            p.unlink(missing_ok=True)
+
+
+def is_overridden() -> bool:
+    """True when a non-empty override file is in effect."""
+    try:
+        with _LOCK:
+            return bool(_path().read_text(encoding="utf-8").strip())
+    except OSError:
+        return False