10 Korean Words from Crime K-Dramas: 형사, 범인, 증거

Quick answer: In Korean crime dramas, 형사 (hyeongsa) means "detective," 범인 (beomin) means "the culprit — the person who actually did it," 용의자 means "suspect," 증거 means "evidence," and 수사 means "(police) investigation." English subtitles often blur 용의자 and 범인 into "suspect," but in Korean they are very different accusations.

Here is the one idea to carry away: Korean crime-drama vocabulary is legally precise, and the drama leans on that precision for drama. When a detective switches from 용의자 to 범인, or from 조사 to 수사, something just changed in the story. Subtitles usually can't show it. You can hear it.

One more thing to listen for: police in these scenes speak 합쇼체 — the stiff, official -습니다/-십니다 style. It's not coldness, it's uniform. The same detective will drop into 해요체 or 반말 the second the scene moves to a late-night street with a friend.

1. 사건 — a case, an incident

이번 사건은 좀 이상해요. "There's something strange about this case."

사건 is the word for a criminal case or a serious incident — the thing the whole series is about. Don't confuse it with 사고, which is an accident (교통사고 = traffic accident). If a Korean says 사건이 있었어요, listeners brace themselves; 사고가 났어요 sounds unlucky, not sinister.

2. 신고하다 — to report (to the police)

경찰에 신고했어요. "I reported it to the police."

신고하다 is what an ordinary citizen does; 수사하다 is what the police do afterward. It's also a perfectly everyday word outside crime scenes — you 신고 a lost wallet or a noisy neighbor. In dramas, the tense version is the imperative: 신고하지 마세요. ("Don't call the police.")

3. 형사 — detective

김 형사님이 맡은 사건이에요. "It's the case Detective Kim is handling."

경찰 is "police" in general; 형사 is specifically a detective, usually in plain clothes. Koreans address them as 형사님, and the surname goes in front: 김 형사님, 박 형사님. The verb that goes with a case is 맡다 — 제가 맡을게요. ("I'll take it.")

4. 수사 / 조사 — investigation vs. questioning

사건을 다시 수사하기로 했습니다. "We've decided to reinvestigate the case."

수사 is the full police investigation into a crime. 조사 is narrower — looking into something, or questioning a person. That's why the line that makes a character's stomach drop is 조사 좀 받으셔야겠습니다. ("You'll need to come in for questioning.") Polite 합쇼체, and still a threat.

5. 용의자 — suspect

용의자가 두 명으로 좁혀졌어요. "The suspects have been narrowed down to two."

용의자 is someone the police suspect but haven't proven anything about. Note the counter: people are counted with 명 (두 명 = two people), which is worth having automatic if you watch these shows — see the Korean counters you can't skip. Calling someone 용의자 is serious but still reversible.

6. 범인 — the culprit, the one who did it

범인은 이 중에 있습니다. "The culprit is one of the people here."

범인 is not "suspect." It means the person who actually committed the crime. So when a detective stops saying 용의자 and starts saying 범인, they have made up their mind — and if they're wrong, that's the plot. In everyday life people use it jokingly too: 누가 내 커피 마셨어? 범인 나와. ("Who drank my coffee? Culprit, step forward.")

7. 증거 — evidence, proof

증거 있어요? "Do you have proof?"

증거 covers both legal evidence and the everyday "proof" you demand in an argument. The two lines you'll hear most are 증거 있어요? and 증거가 없어요. ("There's no evidence.") In 반말 between friends it shortens to 증거 있어? — flat, challenging, very common in a fight scene.

8. 목격자 / 증인 — witness

목격자를 찾고 있습니다. "We're looking for a witness."

목격자 is someone who saw it happen. 증인 is a witness who testifies — the courtroom word. A character can be a 목격자 all series and only become a 증인 in the final episodes, which is exactly the kind of shift a subtitle reading "witness" twice can't show you.

9. 체포하다 — to arrest

살인 혐의로 체포하겠습니다. "I'm placing you under arrest on suspicion of murder."

This is the formal arrest line: 혐의 means "the charge/suspicion," and -(으)로 marks the grounds. Right before it come the shouted commands — 움직이지 마, 손 들어 — the same clipped imperatives covered in the commands you hear in every K-drama. And right after the chase, the exhausted line in the car: 범인을 놓칠 뻔했어요. ("We almost lost him.") — the -(으)ㄹ 뻔했다 pattern for "I almost...".

10. 자백하다 / 자수하다 — to confess / to turn yourself in

결국 다 자백했어요. "In the end, he confessed to everything."

자백 is confessing once you're already caught and being questioned. 자수 is walking in on your own — 자수하세요. ("Turn yourself in.") is the line a detective says quietly to someone they feel sorry for. Mixing them up changes the whole picture of who had a choice.

How the speech level moves

Watch one interrogation scene for register alone. The detective opens in 합쇼체: 앉으십시오, 말씀하십시오. When the pressure rises, they often drop to blunt 반말 — 왜 그랬어? — and that drop is the intimidation. Then a colleague walks in and the same person is suddenly warm and casual. Subtitles print "Why did you do it?" either way; your ear can hear which one it was.

FAQ

What does 형사 mean in Korean?

형사 means "detective" — a police officer who investigates crimes, usually in plain clothes. 경찰 is the broader word for police or a police officer. You address one as 형사님, with the surname in front: 김 형사님.

What is the difference between 용의자 and 범인 in Korean?

용의자 is a suspect — someone the police suspect but haven't proven guilty. 범인 is the actual perpetrator, the one who did it. English subtitles often use "suspect" for both, so when a Korean character switches to 범인, they are stating guilt as fact.

How do you say "you're under arrest" in Korean?

The formal line is 체포하겠습니다 ("I will arrest you"), usually with the charge in front: 살인 혐의로 체포하겠습니다. 혐의 means the suspected charge, and -(으)로 marks what the arrest is based on. In ordinary conversation you'd say 체포됐어요 — "he got arrested."

Practice

Fill in the blank with 사건, 범인, 용의자, 증거, or 자수.

1. 아직 확실하지 않아요. 지금은 ______일 뿐이에요. ("We're not sure yet. For now he's only a ______.")
2. ______ 없으면 못 잡아요. ("Without ______ we can't catch him.")
3. 이번 ______은 좀 복잡해요. ("This ______ is a bit complicated.")
4. 지금이라도 ______하세요. ("______ yourself in, even now.")
5. 드디어 ______을 잡았습니다. ("We finally caught the ______.")