diff --git a/Dockerfile b/Dockerfile
index ab50db4..5683d93 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -12,11 +12,12 @@ COPY requirements.txt ./
 RUN pip install --no-cache-dir -r requirements.txt
 
 COPY app.py assign_teams.py ./
-COPY participants.json ./
+COPY roster.json participants.json ./
 
 EXPOSE 8501
 
 ENV VOTE_DB=/data/votes.db \
+    ROSTER=/app/roster.json \
     PARTICIPANTS=/app/participants.json
 
 CMD ["streamlit", "run", "app.py", \
diff --git a/README.md b/README.md
index ced30be..bb32c46 100644
--- a/README.md
+++ b/README.md
@@ -60,8 +60,20 @@ streamlit run app.py --server.address 0.0.0.0 --server.port 8501
 
 ## 데이터
 
-- `participants.json` — 이름→팀 매핑 (`assign_teams.py` 산출물)
-- `votes.db` (sqlite) — 테이블: `votes(id, voter_name UNIQUE, voter_team, fun_team, polish_team, utility_team, created_at)`
+- `roster.json` — **단일 명단 파일** (`assign_teams.py` 산출물). 호스트에서 직접 편집 가능, 앱이 매 요청 reload.
+  ```json
+  {
+    "people": [
+      {"name": "홍길동", "team": "팀1", "dept": "MLOps Data", "senior": true, "notes": ""},
+      ...
+    ]
+  }
+  ```
+  - 사람을 다른 팀으로 옮기기: `team` 값만 변경
+  - 사람 추가/제거: 객체 추가/삭제
+  - 변경 후 컨테이너 재시작 불필요 (핫리로드)
+- `participants.json` — legacy 형식 (이름→팀 string). roster.json 없으면 fallback.
+- `votes.db` (sqlite, WAL) — `votes`, `team_titles`, `tie_breaks`, `settings` 테이블
 
 ## 운영 팁
 
diff --git a/app.py b/app.py
index 500773b..45ddaa2 100644
--- a/app.py
+++ b/app.py
@@ -13,23 +13,47 @@ import streamlit as st
 
 DB_PATH = os.environ.get("VOTE_DB", "votes.db")
 ADMIN_TOKEN = os.environ.get("ADMIN_TOKEN", "change-me")
-PARTICIPANTS_PATH = os.environ.get(
+ROSTER_PATH = os.environ.get(
+    "ROSTER", str(Path(__file__).parent / "roster.json")
+)
+LEGACY_PARTICIPANTS_PATH = os.environ.get(
     "PARTICIPANTS", str(Path(__file__).parent / "participants.json")
 )
 
 
-def load_participants():
-    """이름→팀 매핑. 파일 없으면 빈 dict."""
-    p = Path(PARTICIPANTS_PATH)
-    if not p.exists():
-        return {}
-    return json.loads(p.read_text(encoding="utf-8"))
+def load_roster():
+    """
+    roster.json 우선, 없으면 legacy participants.json fallback.
+    매 호출마다 디스크에서 read → 호스트 편집 핫리로드.
+    return: {"people": [...]} 형식 dict
+    """
+    roster_p = Path(ROSTER_PATH)
+    if roster_p.exists():
+        return json.loads(roster_p.read_text(encoding="utf-8"))
+
+    legacy_p = Path(LEGACY_PARTICIPANTS_PATH)
+    if legacy_p.exists():
+        # legacy: {name: team_str}
+        legacy = json.loads(legacy_p.read_text(encoding="utf-8"))
+        return {
+            "people": [
+                {"name": n, "team": t, "dept": "", "senior": False, "notes": ""}
+                for n, t in legacy.items()
+            ]
+        }
+    return {"people": []}
 
 
-PARTICIPANTS = load_participants()
-TEAMS = sorted(set(PARTICIPANTS.values())) if PARTICIPANTS else [
-    f"팀{i}" for i in range(1, 8)
-]
+def get_participants():
+    """이름→팀 매핑. 매 호출 reload (호스트 편집 즉시 반영)."""
+    roster = load_roster()
+    return {p["name"]: p["team"] for p in roster.get("people", [])}
+
+
+def get_teams():
+    """팀명 정렬 list. 매 호출 reload."""
+    parts = get_participants()
+    return sorted(set(parts.values())) if parts else [f"팀{i}" for i in range(1, 8)]
 
 CATEGORIES = [
     ("fun_team", "🎉 재미상", "손선풍기 5개"),
@@ -268,7 +292,9 @@ def render_voter():
 
     st.caption("이름 선택 → 본인 팀 자동 매핑 → 본인 팀 제외 3분야 투표. 한 번만 제출 가능.")
 
-    if not PARTICIPANTS:
+    PARTS = get_participants()
+    TEAMS = get_teams()
+    if not PARTS:
         st.error("참가자 명단이 없습니다. `assign_teams.py` 먼저 실행하세요.")
         return
 
@@ -284,7 +310,7 @@ def render_voter():
 
     name = st.selectbox(
         "본인 이름",
-        options=sorted(PARTICIPANTS.keys()),
+        options=sorted(PARTS.keys()),
         index=None,
         placeholder="이름 선택",
         format_func=fmt_name,
@@ -308,7 +334,7 @@ def render_voter():
         st.warning("사번 입력 후 진행하세요.")
         return
 
-    my_team = PARTICIPANTS[name]
+    my_team = PARTS[name]
     titles = get_titles()
     st.info(f"본인 팀: **{fmt_team(my_team, titles)}**")
     candidates = [t for t in TEAMS if t != my_team]
@@ -382,10 +408,12 @@ def render_admin():
 
     st.divider()
 
+    PARTS = get_participants()
+    TEAMS = get_teams()
     conn = get_conn()
     total = conn.execute("SELECT COUNT(*) FROM votes").fetchone()[0]
 
-    expected = len(PARTICIPANTS) if PARTICIPANTS else None
+    expected = len(PARTS) if PARTS else None
     col_a, col_b, col_c = st.columns(3)
     col_a.metric("투표 참여자", f"{total}명")
     col_b.metric("팀 수", f"{len(TEAMS)}팀")
@@ -395,10 +423,10 @@ def render_admin():
 
     if expected and total < expected:
         voted = {row[0] for row in conn.execute("SELECT voter_name FROM votes").fetchall()}
-        not_voted = [n for n in PARTICIPANTS.keys() if n not in voted]
+        not_voted = [n for n in PARTS.keys() if n not in voted]
         with st.expander(f"⏳ 미투표자 ({len(not_voted)}명)"):
             for n in sorted(not_voted):
-                st.write(f"- {n} ({PARTICIPANTS[n]})")
+                st.write(f"- {n} ({PARTS[n]})")
 
     st.divider()
     st.subheader("📝 팀별 결과물 제목 입력")
diff --git a/assign_teams.py b/assign_teams.py
index 71a612d..b3e7d5a 100644
--- a/assign_teams.py
+++ b/assign_teams.py
@@ -240,12 +240,40 @@ def main():
             mapping[name] = team_name
         print()
 
+    # roster.json (단일 파일, 호스트에서 직접 편집 가능)
+    people_records = []
+    for i, team in enumerate(teams, 1):
+        team_name = f"팀{i}"
+        for name, dept in team:
+            note_parts = []
+            if name == "한지승":
+                note_parts.append("지각 가능")
+            if name == "김재현":
+                note_parts.append("최주니어")
+            people_records.append(
+                {
+                    "name": name,
+                    "team": team_name,
+                    "dept": dept,
+                    "senior": name in SENIORS,
+                    "notes": ", ".join(note_parts),
+                }
+            )
+
+    roster_path = Path(__file__).parent / "roster.json"
+    roster_path.write_text(
+        json.dumps({"people": people_records}, ensure_ascii=False, indent=2),
+        encoding="utf-8",
+    )
+    print(f"저장: {roster_path}")
+
+    # 구 형식 호환 (legacy participants.json 도 함께 저장 — 마이그레이션 기간)
     out = Path(__file__).parent / "participants.json"
     out.write_text(
         json.dumps(mapping, ensure_ascii=False, indent=2),
         encoding="utf-8",
     )
-    print(f"저장: {out}")
+    print(f"저장: {out} (legacy)")
 
     # teams.md 박제 (진행자 인쇄/공유용)
     md_lines = ["# 해커톤 팀 배정 (확정)\n"]
diff --git a/docker-compose.yml b/docker-compose.yml
index af9b6d0..29aecb5 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -8,11 +8,14 @@ services:
     environment:
       ADMIN_TOKEN: ${ADMIN_TOKEN:-change-me}
       VOTE_DB: /data/votes.db
+      ROSTER: /app/roster.json
       PARTICIPANTS: /app/participants.json
     volumes:
-      # 호스트의 participants.json 변경 즉시 반영 (재배정 시)
+      # roster.json 호스트 편집 즉시 반영 (앱이 매 요청 reload)
+      - ./roster.json:/app/roster.json:ro
+      # legacy participants.json fallback
       - ./participants.json:/app/participants.json:ro
-      # 투표 DB는 호스트에 영속 (컨테이너 재시작해도 유지)
+      # 투표 DB 영속
       - vote-data:/data
     restart: unless-stopped
 
diff --git a/roster.json b/roster.json
new file mode 100644
index 0000000..95eda74
--- /dev/null
+++ b/roster.json
@@ -0,0 +1,242 @@
+{
+  "people": [
+    {
+      "name": "김호승",
+      "team": "팀1",
+      "dept": "AI Efficiency Tech",
+      "senior": false,
+      "notes": ""
+    },
+    {
+      "name": "유준희",
+      "team": "팀1",
+      "dept": "AI Efficiency Tech",
+      "senior": false,
+      "notes": ""
+    },
+    {
+      "name": "이준석",
+      "team": "팀1",
+      "dept": "MLOps HPC",
+      "senior": false,
+      "notes": ""
+    },
+    {
+      "name": "장다현",
+      "team": "팀1",
+      "dept": "MLOps System",
+      "senior": false,
+      "notes": ""
+    },
+    {
+      "name": "강승형",
+      "team": "팀1",
+      "dept": "MLOps Data",
+      "senior": true,
+      "notes": ""
+    },
+    {
+      "name": "서한배",
+      "team": "팀2",
+      "dept": "AI Efficiency Tech",
+      "senior": false,
+      "notes": ""
+    },
+    {
+      "name": "김민섭",
+      "team": "팀2",
+      "dept": "AI Efficiency Tech",
+      "senior": false,
+      "notes": ""
+    },
+    {
+      "name": "유용혁",
+      "team": "팀2",
+      "dept": "MLOps HPC",
+      "senior": false,
+      "notes": ""
+    },
+    {
+      "name": "박영훈",
+      "team": "팀2",
+      "dept": "MLOps System",
+      "senior": true,
+      "notes": ""
+    },
+    {
+      "name": "박재호",
+      "team": "팀2",
+      "dept": "MLOps Data",
+      "senior": false,
+      "notes": ""
+    },
+    {
+      "name": "이성재",
+      "team": "팀3",
+      "dept": "AI Efficiency Tech",
+      "senior": false,
+      "notes": ""
+    },
+    {
+      "name": "이재광",
+      "team": "팀3",
+      "dept": "AI Efficiency Tech",
+      "senior": false,
+      "notes": ""
+    },
+    {
+      "name": "김영관",
+      "team": "팀3",
+      "dept": "MLOps HPC",
+      "senior": true,
+      "notes": ""
+    },
+    {
+      "name": "정채윤",
+      "team": "팀3",
+      "dept": "MLOps System",
+      "senior": false,
+      "notes": ""
+    },
+    {
+      "name": "변수민",
+      "team": "팀3",
+      "dept": "MLOps Data",
+      "senior": true,
+      "notes": ""
+    },
+    {
+      "name": "심성환",
+      "team": "팀4",
+      "dept": "AI Efficiency Tech",
+      "senior": false,
+      "notes": ""
+    },
+    {
+      "name": "유지원",
+      "team": "팀4",
+      "dept": "AI Efficiency Tech",
+      "senior": false,
+      "notes": ""
+    },
+    {
+      "name": "오근현",
+      "team": "팀4",
+      "dept": "MLOps HPC",
+      "senior": false,
+      "notes": ""
+    },
+    {
+      "name": "장혁진",
+      "team": "팀4",
+      "dept": "MLOps System",
+      "senior": false,
+      "notes": ""
+    },
+    {
+      "name": "손현준",
+      "team": "팀4",
+      "dept": "MLOps Data",
+      "senior": true,
+      "notes": ""
+    },
+    {
+      "name": "정현준",
+      "team": "팀5",
+      "dept": "AI Efficiency Tech",
+      "senior": false,
+      "notes": ""
+    },
+    {
+      "name": "조민정",
+      "team": "팀5",
+      "dept": "AI Efficiency Tech",
+      "senior": false,
+      "notes": ""
+    },
+    {
+      "name": "김재현",
+      "team": "팀5",
+      "dept": "MLOps HPC",
+      "senior": false,
+      "notes": "최주니어"
+    },
+    {
+      "name": "김병훈",
+      "team": "팀5",
+      "dept": "MLOps System",
+      "senior": true,
+      "notes": ""
+    },
+    {
+      "name": "한지승",
+      "team": "팀5",
+      "dept": "MLOps Platform",
+      "senior": true,
+      "notes": "지각 가능"
+    },
+    {
+      "name": "이정태",
+      "team": "팀6",
+      "dept": "AI Efficiency Tech",
+      "senior": false,
+      "notes": ""
+    },
+    {
+      "name": "최호진",
+      "team": "팀6",
+      "dept": "MLOps HPC",
+      "senior": false,
+      "notes": ""
+    },
+    {
+      "name": "김정명",
+      "team": "팀6",
+      "dept": "MLOps HPC",
+      "senior": true,
+      "notes": ""
+    },
+    {
+      "name": "길주현",
+      "team": "팀6",
+      "dept": "MLOps System",
+      "senior": false,
+      "notes": ""
+    },
+    {
+      "name": "서희",
+      "team": "팀6",
+      "dept": "MLOps System",
+      "senior": true,
+      "notes": ""
+    },
+    {
+      "name": "이준형",
+      "team": "팀7",
+      "dept": "AI Efficiency Tech",
+      "senior": false,
+      "notes": ""
+    },
+    {
+      "name": "전효준",
+      "team": "팀7",
+      "dept": "MLOps HPC",
+      "senior": true,
+      "notes": ""
+    },
+    {
+      "name": "이지환",
+      "team": "팀7",
+      "dept": "MLOps System",
+      "senior": false,
+      "notes": ""
+    },
+    {
+      "name": "김동국",
+      "team": "팀7",
+      "dept": "MLOps Data",
+      "senior": false,
+      "notes": ""
+    }
+  ]
+}
\ No newline at end of file