TL;DR 🦄
- -기가 무섭게 means the moment / no sooner than / as soon as.
- It emphasizes that the second action happens immediately after the first action.
- It often feels dramatic, vivid, and a little stronger than everyday -자마자.
🎧 Iru Helper Note — Open 
Korean Helper Widgets and listen to 수업이 끝나기가 무섭게 학생들이 나갔어요, 문을 열기가 무섭게 고양이가 뛰어나왔어요, and 집에 도착하기가 무섭게 비가 오기 시작했어요. Hear the “immediately!” feeling after the first action.
🌈 The Big Picture
-기가 무섭게 is a timing expression for instant sequence.
It says:
As soon as A happened, B happened immediately.
The second event feels so fast that there is almost no gap between A and B.
Examples:
- 수업이 끝나기가 무섭게 학생들이 나갔어요.
[su-eo-bi kkeut-na-gi-ga mu-seop-kke hak-saeng-deu-ri na-ga-sseo-yo]
The moment class ended, the students left.
- 문을 열기가 무섭게 고양이가 뛰어나왔어요.
[mu-neul yeol-gi-ga mu-seop-kke go-yang-i-ga ttwi-eo-na-wa-sseo-yo]
The moment I opened the door, the cat ran out.
- 집에 도착하기가 무섭게 비가 오기 시작했어요.
[ji-be do-cha-ka-gi-ga mu-seop-kke bi-ga o-gi si-ja-kae-sseo-yo]
No sooner had I arrived home than it started raining.
This expression is great for stories, sudden reactions, quick exits, immediate changes, and dramatic timing.
🎨 What -기가 무섭게 Is Made Of
-기
Turns a verb into a noun-like action: “doing / the act of doing.”
가
Subject marker attached to the action phrase.
무섭게
Literally related to “fearfully / frighteningly,” but in this grammar it means the next action happens so quickly it is almost startling.
Together:
V-기가 무섭게 = the moment V happens / no sooner than V
The literal feeling is not usually “scary.” It is more like:
So soon after A that it feels startling.
🧩 Formation Rule
Verb stem + 기가 무섭게
Attach -기가 무섭게 directly to the verb stem.
- 끝나다 → 끝나기가 무섭게 — the moment it ends
- 도착하다 → 도착하기가 무섭게 — the moment someone arrives
- 열다 → 열기가 무섭게 — the moment someone opens
- 시작하다 → 시작하기가 무섭게 — the moment it starts
- 말하다 → 말하기가 무섭게 — the moment someone says it
- 앉다 → 앉기가 무섭게 — the moment someone sits down
No tense inside the first verb
The first verb usually stays in the dictionary-stem + -기 shape. Put tense in the second clause.
- ✅ 수업이 끝나기가 무섭게 학생들이 나갔어요.
- ❌ 수업이 끝났기가 무섭게 학생들이 나갔어요.
Usually action verbs
This expression works best with clear actions or events that can happen at a point in time.
Natural:
- 도착하기가 무섭게 — as soon as someone arrived
- 말하기가 무섭게 — as soon as someone said it
- 끝나기가 무섭게 — as soon as it ended
Less natural:
- 예쁘기가 무섭게 for “as soon as it is pretty” ❌
For adjectives, use other patterns depending on the meaning.
🛠️ How It Works in Real Sentences
1. Class ends → students leave
- 수업이 끝나기가 무섭게 학생들이 교실을 나갔어요.
[su-eo-bi kkeut-na-gi-ga mu-seop-kke hak-saeng-deu-ri gyo-si-reul na-ga-sseo-yo]
The moment class ended, the students left the classroom.
2. Door opens → cat runs out
- 문을 열기가 무섭게 고양이가 밖으로 뛰어나왔어요.
[mu-neul yeol-gi-ga mu-seop-kke go-yang-i-ga ba-kkeu-ro ttwi-eo-na-wa-sseo-yo]
The moment I opened the door, the cat ran outside.
3. Arrive → rain starts
- 집에 도착하기가 무섭게 비가 쏟아지기 시작했어요.
[ji-be do-cha-ka-gi-ga mu-seop-kke bi-ga sso-da-ji-gi si-ja-kae-sseo-yo]
No sooner had I arrived home than it started pouring.
4. Message arrives → reply comes
- 메시지를 보내기가 무섭게 답장이 왔어요.
[me-si-ji-reul bo-nae-gi-ga mu-seop-kke dap-ja-ngi wa-sseo-yo]
The moment I sent the message, a reply came.
5. Announcement ends → people react
- 발표가 끝나기가 무섭게 질문이 쏟아졌어요.
[bal-pyo-ga kkeut-na-gi-ga mu-seop-kke jil-mu-ni sso-da-jyeo-sseo-yo]
The moment the presentation ended, questions poured in.
🔍 Nuance: -기가 무섭게 vs Similar Timing Grammar
-자마자
Common, direct “as soon as.”
- 집에 도착하자마자 잤어요.
As soon as I arrived home, I slept.
-기가 무섭게
More vivid, dramatic, and immediate. The second action feels like it happened almost instantly.
- 집에 도착하기가 무섭게 비가 쏟아졌어요.
The moment I arrived home, rain started pouring.
-(으)ㄴ/는 순간
Names the exact moment/instant.
- 문을 여는 순간 고양이가 나왔어요.
The moment I opened the door, the cat came out.
-자
Written/story-like “as soon as / when.”
- 문이 열리자 사람들이 들어왔어요.
As soon as the door opened, people came in.
-기가 바쁘게
Very close; often means immediately after, with a rushed or abrupt feeling.
- 도착하기가 바쁘게 다시 나갔어요.
They left again immediately after arriving.
Easy contrast:
- most common “as soon as” → -자마자
- exact instant → 순간
- vivid “the moment / no sooner than” → -기가 무섭게
- abrupt/rushed immediate after → -기가 바쁘게
📚 Cross-check note
This lesson connects with The moment that: -(으)ㄴ/는 순간, Sequence: Just as / Right after: -자마자, Right after / Following: -자, and The moment after (Abrupt): -기가 바쁘게. The key difference: -기가 무섭게 highlights immediate sequence with a vivid, almost startling speed.
🪞 Common Chunks
- 끝나기가 무섭게 — the moment it ended
- 도착하기가 무섭게 — the moment someone arrived
- 열기가 무섭게 — the moment someone opened it
- 말하기가 무섭게 — the moment someone said it
- 앉기가 무섭게 — the moment someone sat down
- 시작하기가 무섭게 — the moment it started
- 나오기가 무섭게 — the moment someone came out
- 보내기가 무섭게 — the moment someone sent it
⚠️ Pitfalls to Dodge
- ❌ 끝났기가 무섭게
✅ 끝나기가 무섭게
- ❌ 도착했기가 무섭게
✅ 도착하기가 무섭게
- ❌ Using it for a long duration.
✅ Use it for near-instant sequence.
- ❌ Using it for simple neutral timing when no dramatic speed is needed.
✅ Use -자마자 for neutral “as soon as.”
- ⚠️ The word 무섭게 does not usually mean “scarily” here. It emphasizes startling immediacy.
➡️ Bottom line: -기가 무섭게 is a vivid “the moment / no sooner than” pattern. Use it when the second event happens almost immediately after the first: 수업이 끝나기가 무섭게 학생들이 나갔어요.
Try this exercise
Instructions: Complete each sentence with the correct -기가 무섭게 form.
1. 끝나다 → 수업이 ＿＿＿＿ 학생들이 나갔어요.
Answer
끝나기가 무섭게.
2. 도착하다 → 집에 ＿＿＿＿ 비가 오기 시작했어요.
Answer
도착하기가 무섭게.
3. 열다 → 문을 ＿＿＿＿ 고양이가 뛰어나왔어요.
Answer
열기가 무섭게.
4. 말하다 → 그 말을 ＿＿＿＿ 모두 웃었어요.
Answer
말하기가 무섭게.
5. Fix: ❌ 도착했기가 무섭게
Answer
✅ 도착하기가 무섭게.
6. Translate: “The moment class ended, the students left.”
Answer
수업이 끝나기가 무섭게 학생들이 나갔어요.
7. Translate: “No sooner had I sent the message than a reply came.”
Answer
메시지를 보내기가 무섭게 답장이 왔어요.
8. Choose neutral “as soon as”:
① -자마자 / ② -기가 무섭게
Answer
① -자마자.
9. -기가 무섭게 emphasizes:
Answer
Immediate, vivid, almost startling sequence.
10. Does 무섭게 always mean “scarily” here?
Answer
No. In this grammar, it mainly emphasizes how quickly B happens after A.
Vocabulary Box
- 끝나다 [kkeut-na-da] → to end
- 도착하다 [do-cha-ka-da] → to arrive
- 열다 [yeol-da] → to open
- 뛰어나오다 [ttwi-eo-na-o-da] → to run out
- 답장 [dap-jang] → reply
- 쏟아지다 [sso-da-ji-da] → to pour / flood in
Tip 💡 If the second event happens instantly, -기가 무섭게 can make the timing vivid.
Want more reps? The Practice Hub below trains dramatic immediate sequence and contrasts with -자마자, 순간, and -기가 바쁘게.
🎯 Practice Hub — The moment: -기가 무섭게
Welcome to the instant-sequence lab. ⚡ You’ll practice fast exits, sudden reactions, instant changes, and dramatic timing.
🔊 Audio reminder: Use Korean Helper Widgets whenever you want to hear a sentence aloud.
Exercise 1 — Form Builder 🔧
A. 끝나다 → ＿＿＿＿
Answer
끝나기가 무섭게.
B. 시작하다 → ＿＿＿＿
Answer
시작하기가 무섭게.
C. 도착하다 → ＿＿＿＿
Answer
도착하기가 무섭게.
D. 열다 → ＿＿＿＿
Answer
열기가 무섭게.
E. 앉다 → ＿＿＿＿
Answer
앉기가 무섭게.
F. 말하다 → ＿＿＿＿
Answer
말하기가 무섭게.
G. 보내다 → ＿＿＿＿
Answer
보내기가 무섭게.
H. 나오다 → ＿＿＿＿
Answer
나오기가 무섭게.
I. 전화하다 → ＿＿＿＿
Answer
전화하기가 무섭게.
J. 확인하다 → ＿＿＿＿
Answer
확인하기가 무섭게.
Form Box
Verb stem + 기가 무섭게
No past tense inside the first verb:
- ✅ 끝나기가 무섭게
- ❌ 끝났기가 무섭게
Exercise 2 — Instant Reaction Sentences ⚡
A. 수업이 ＿＿＿＿ 학생들이 나갔어요. (end)
Answer
끝나기가 무섭게.
B. 문을 ＿＿＿＿ 강아지가 뛰어나왔어요. (open)
Answer
열기가 무섭게.
C. 의자에 ＿＿＿＿ 전화가 왔어요. (sit)
Answer
앉기가 무섭게.
D. 그 말을 ＿＿＿＿ 모두 조용해졌어요. (say)
Answer
말하기가 무섭게.
E. 회의가 ＿＿＿＿ 질문이 쏟아졌어요. (end)
Answer
끝나기가 무섭게.
F. 알림이 ＿＿＿＿ 사람들이 몰려왔어요. (come out/appear)
Answer
나오기가 무섭게.
G. 가게가 ＿＿＿＿ 손님들이 들어왔어요. (open)
Answer
열기가 무섭게.
H. 시험지가 ＿＿＿＿ 학생들이 쓰기 시작했어요. (be distributed/come out)
Answer
나오기가 무섭게 / 배부되기가 무섭게.
I. 결과를 ＿＿＿＿ 다시 확인했어요. (confirm/check)
Answer
확인하기가 무섭게.
J. 전화가 ＿＿＿＿ 바로 받았어요. (ring/come)
Answer
오기가 무섭게.
Instant reaction words
- 몰려오다 → to rush/crowd in
- 조용해지다 → to become quiet
- 쏟아지다 → to pour/flood in
- 배부되다 → to be distributed
- 바로 → right away
Exercise 3 — Translate into Korean ✍️
A. “The moment class ended, everyone left.”
Answer
수업이 끝나기가 무섭게 모두 나갔어요.
B. “No sooner had I arrived home than it started raining.”
Answer
집에 도착하기가 무섭게 비가 오기 시작했어요.
C. “The moment I opened the door, the dog ran out.”
Answer
문을 열기가 무섭게 강아지가 뛰어나왔어요.
D. “The moment I sent the message, a reply came.”
Answer
메시지를 보내기가 무섭게 답장이 왔어요.
E. “The moment the meeting ended, questions poured in.”
Answer
회의가 끝나기가 무섭게 질문이 쏟아졌어요.
F. “The moment the store opened, customers came in.”
Answer
가게가 열기가 무섭게 손님들이 들어왔어요.
G. “The moment I sat down, the phone rang.”
Answer
앉기가 무섭게 전화가 왔어요.
H. “The moment the announcement started, people became quiet.”
Answer
안내 방송이 시작하기가 무섭게 사람들이 조용해졌어요.
I. “The moment I checked the result, I called my friend.”
Answer
결과를 확인하기가 무섭게 친구에게 전화했어요.
J. “The moment the concert ended, applause poured out.”
Answer
공연이 끝나기가 무섭게 박수가 쏟아졌어요.
Writing tip
Use -기가 무섭게 when the second event is so immediate that it feels dramatic:
A하기가 무섭게 B했어요.
Exercise 4 — Choose the Best Timing Grammar 🧭
A. Neutral “as soon as I arrived”:
① 도착하자마자 / ② 도착하기가 무섭게
Answer
① is more neutral. ② is more vivid/dramatic.
B. Dramatic immediate exit:
① 수업이 끝나기가 무섭게 학생들이 나갔어요.
② 수업 동안 학생들이 나갔어요.
Answer
①.
C. Exact instant:
① 문을 여는 순간 고양이가 나왔어요.
② 문을 여는 동안 고양이가 나왔어요.
Answer
①.
D. Duration:
① 두 시간 동안 공부했어요.
② 두 시간 무섭게 공부했어요.
Answer
①.
E. Middle of action:
① 공부하는 도중에 전화가 왔어요.
② 공부하기가 무섭게 전화가 왔어요.
Answer
① if the call came while studying. ② would mean right as studying began.
F. “The moment the announcement ended, people asked questions”:
① 발표가 끝나기가 무섭게 질문이 나왔어요.
② 발표가 끝났기가 무섭게 질문이 나왔어요.
Answer
①. Do not put past tense before -기.
G. -기가 무섭게 feels:
Answer
Immediate, vivid, dramatic, and sometimes startling.
H. -자마자 feels:
Answer
Common, direct, and neutral.
I. 순간 names:
Answer
An exact moment or instant.
J. 도중에 means:
Answer
In the middle of an ongoing action.
Decision Box
- neutral as soon as → -자마자
- vivid immediate after → -기가 무섭게
- exact moment → 순간
- middle of action → 도중에
- duration → 동안
Exercise 5 — Mixed Mastery + Pitfall Patrol 🛡️
A. Fix: ❌ 끝났기가 무섭게
Answer
✅ 끝나기가 무섭게.
B. Fix: ❌ 도착했기가 무섭게
Answer
✅ 도착하기가 무섭게.
C. Fix: ❌ 문을 열었기가 무섭게
Answer
✅ 문을 열기가 무섭게.
D. Translate: “The moment I said that, everyone laughed.”
Answer
그 말을 하기가 무섭게 모두 웃었어요.
E. Translate: “The moment the event started, people came in.”
Answer
행사가 시작하기가 무섭게 사람들이 들어왔어요.
F. Choose vivid immediate sequence: ① -기가 무섭게 / ② 동안
Answer
① -기가 무섭게.
G. Choose duration: ① -기가 무섭게 / ② 동안
Answer
② 동안.
H. What should come before -기가 무섭게?
Answer
A verb stem, without tense: 끝나기, 도착하기, 말하기.
I. What should happen after -기가 무섭게?
Answer
Another event that happens almost immediately.
J. Does -기가 무섭게 work best for slow, long periods?
Answer
No. It works best for fast, near-instant sequence.
Final Check
- 끝나다 → 끝나기가 무섭게
- 도착하다 → 도착하기가 무섭게
- 열다 → 열기가 무섭게
- 말하다 → 말하기가 무섭게
- 보내다 → 보내기가 무섭게
Final Boss Rule 💡 No past tense inside the first verb. Use verb stem + -기가 무섭게, then a fast second event.
🎉 Dramatic timing grammar unlocked. Now you can describe “the moment / no sooner than” events with 끝나기가 무섭게, 도착하기가 무섭게, 열기가 무섭게, and 말하기가 무섭게. ⚡✨
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