니까 meaning — the Korean "because" that carries an attitude (56 real examples)

니까 is the second most common ending in our clip scripts — 978 lines — and it is the one learners reach for first when they want to say because.

That instinct is right about half the time. 니까 does give a reason, but it gives it with a particular stance: the speaker is treating the reason as grounds for what they are about to say or ask, not merely as a fact that happened to cause something.

That difference is invisible in English, where one because covers everything. In Korean it decides whether a sentence sounds natural or slightly off, and it is the single most common source of the error we cover further down.

Every line below is real speech from clips we transcribed, grouped by who you can say it to.

니까 vs 아서/어서 — the mistake almost everyone makes

Korean has more than one because, and choosing wrongly is the most reliable way to sound like a textbook.

The short version: 니까 gives grounds, 아서/어서 gives cause.

Grounds means the reason justifies what the speaker is doing — asking, suggesting, ordering, concluding. Cause means one thing simply produced another.

That is why 니까 is the one you use before a request or a suggestion. It's cold, so close the window takes 니까, because the cold is your justification for asking. It was cold, so I got sick takes 아서, because the cold merely caused the illness.

The rule that falls out of this is worth memorising outright: commands and suggestions take 니까, not 아서. Getting this backwards is grammatically wrong rather than merely unnatural, and it is the error a Korean speaker will notice immediately.

One more asymmetry. 아서 cannot carry a past-tense marker before it, but 니까 can. If you need to say because it had already happened, 니까 is the one that survives.

The second use — discovering something

There is a use of 니까 that has nothing to do with because, and it will confuse you the first few times you meet it.

After a verb of doing or going, 니까 can mean upon doing it, I found that…. The speaker did something and discovered what followed.

In English this needs a whole clause — when I got there, it turned out that. Korean folds it into the same two syllables.

You can tell the two apart by what follows. If the second half is a request, a suggestion, or a conclusion, it is the because use. If the second half is a discovery the speaker could not have known in advance, it is this one.

It pairs naturally with 더라고, which marks the discovery itself as something witnessed firsthand — and the two often appear in the same sentence.

Casual, giving grounds — 니까

The form you will hear most, between people who are close.

Read the second half of each line first. Most of them are a suggestion, a decision, or a conclusion — and the 니까 clause exists to justify it.

That is the shape to internalise. The reason is not floating there as information; it is doing work for whatever comes next.

You will also notice how often the speaker is defending a choice rather than explaining a fact. That is the ending's natural home.

• 이게 대용량으로 하다 보니까 (bonikka) — I think it's different from the usual recipe.
• 그러니까 나도 원래 이거.. (geureonikka) — I first wasn't thinking of.
• 진짜 시간이 생명이니까 지금 (saengmyeonginikka) — Because time is money now.
• 아니야 얼음 했으니까 비빔면 (haesseunikka) — No, it could be spicy cold noodles since we picked ice. Literally: 했으니까 is said 해쓰니까.
• 끝난 인생이니까 말 걸지마. (insaenginikka) — Don't talk to me because my life is over.
• 내일 못 일어날 것 같으니까 (gateunikka) — I don't think we'll be able to get up tomorrow, so. Literally: 같으니까 is said 가트니까.
• 그러니까 자기가 다 내겠다고 (geureonikka) — Then, he said he will pay.
• 불공평한데 게임이니까 빠진다 (geiminikka) — really unfair, but it's a game, so I'm out. Literally: 게임이니까 is said 게이미니까.
• 이렇게 가니까 좀 숨 막힌다 (ganikka) — after they succeeded.
• 형 이제 분량 다 뽑았으니까 (ppobasseunikka) — Now that you've hogged up the airtime,. Literally: 뽑았으니까 is said 뽀바쓰니까.
• 그럼 마피아가 다 가져가니까 (gajeoganikka) — Then, the mafia takes it all. Literally: 가져가니까 is said 가저가니까.
• 원래 마피아가 그런 거라니까 (georanikka) — That's just what the mafia game is like.
• 아니 너 18만 원 썼다니까 (sseotdanikka) — No, you spent 180,000 won. Literally: 썼다니까 is said 썯따니까.
• 그러니까, 다 준비해 주셨어 (geureonikka) — I know. They prepared everything.
• 아니 또 아니라고 그러니까. (geureonikka) — Because you said you weren't the one.
• 그러고 가시면 어떡하십니까. (eotteokasimnikka) — How can you leave after saying that. Literally: 어떡하십니까 is said 어떠카심니까.
• 크런치가 킥이라고 하셨으니까 (hasyeosseunikka) — Since you said the crunch was the key point. Literally: 하셨으니까 is said 하셔쓰니까.
• 더우니까 퇴근이 오히려 좋아 (deounikka) — It's hot so it's better to go home.
• 지금 직급이 어떻게 되십니까 (doesimnikka) — What's your current job title? Literally: 되십니까 is said 되심니까.
• 본인 데뷔 일이 언제입니까! (eonjeimnikka) — What was the date of your debut?! Literally: 언제입니까 is said 언제임니까.

Polite, giving grounds — 니까요 and polite endings after 니까

In polite speech the 니까 clause usually sits in the middle, with the politeness landing on the final verb rather than on 니까 itself.

That is worth seeing directly, because it corrects a common assumption. Politeness in Korean is carried by the ending of the sentence, not by every clause inside it.

So these lines give grounds and then close politely, which is the shape you want when explaining yourself to someone senior or on camera.

This is the most useful section for production. A reason plus a polite closing is a complete, safe, natural Korean sentence.

• 10분 남았으니까요...! (namasseunikkayo) — Since we have 10 minutes left...! Literally: 남았으니까요 is said 나마쓰니까요.
• 이룰 거 다 이뤘으니까요. (irwosseunikkayo) — I've seen everything now. Literally: 이뤘으니까요 is said 이뤄쓰니까요.
• 저도 트렌드 따라간다니까요 (ttaragandanikkayo) — I do know about them.
• 나 진짜 아니라니까요. (aniranikkayo) — It really isn't me.
• 전 음악의 신이니까요 (sininikkayo) — Because I am the god of music. Literally: 신이니까요 is said 시니니까요.
• 아 광수 같다니까요. (gatdanikkayo) — I think it's Kwangsoo. Literally: 같다니까요 is said 갇따니까요.
• 왜냐하면 여러분들은 슈퍼스타니까요. (syupeoseutanikkayo) — because you guys are all superstars.
• 그러니까요, 이런 거 (geureonikkayo) — Yes, like this.
• 그러니까요 저를 아는 분들은 아는데 (geureonikkayo) — Right, people who know me get it, but.
• 깨어있는 거 아니니까요, 그냥 그대로 (aninikkayo) — Because we're not awake, just like that.
• 아니 찾았다니까요 (chajatdanikkayo) — I found mine already. Literally: 찾았다니까요 is said 차잗따니까요.
• 빈티지 카메라로 촬영은 계속될 거니까요 (geonikkayo) — we'll continue to film using this vintage camera.
• 그러니까요 진짜~ (geureonikkayo) — Right, seriously~.
• 나 몰랐다니까요 (mollatdanikkayo) — No, it wasn't on purpose. Literally: 몰랐다니까요 is said 몰랃따니까요.
• 구 개라니까요 (gaeranikkayo) — No, it's two!
• 아 근데 뭐 저희만 봐도 일단은... 네 나오니까요 (naonikkayo) — I mean, just by looking at us... You can see what you're in for.

Casual, asking — 니까?

With a question mark, the speaker offers grounds and asks the other person to accept them.

It is closer to right? than to a genuine question — a check that the justification has landed before moving on.

Between friends this often appears in the middle of an argument, where each turn is someone laying down grounds and testing whether they hold.

You will also hear the discovery use here, where the speaker did something, found a result, and is asking the others to react to it.

• 내가 구기 종목 잘한다니까? (jalhandanikka) — I told you, I'm good at ball games.
• 본인 데뷔 일이 며칠입니까? (myeochirimnikka) — What was the date of your debut? Literally: 며칠입니까 is said 며치림니까.
• 안전성 믿을 수 있습니까?! (itseumnikka) — Can you trust me to carry it safely? Literally: 있습니까 is said 읻씀니까.
• 어땠어요? 막내로 살아보니까 (sarabonikka) — How was it, living as the youngest? Literally: 살아보니까 is said 사라보니까.
• 알러지가 있으면 어떡합니까? (eotteokamnikka) — What if I'm allergic? Literally: 어떡합니까 is said 어떠캄니까.
• 내가 봤을 땐 여왕이라니까?! (yeowangiranikka) — I’m telling you, she’s a queen!
• 일단 혹시 모르니까 챙겨볼까? (moreunikka) — Shall we take this just in case?
• 결승전이니까 7점 내기 할래? (gyeolseungjeoninikka) — It's the final so let's make it 7 points to win. Literally: 결승전이니까 is said 결승저니니까.
• 지금 트레이닝 중이라니까? (jungiranikka) — We're getting trained.
• 그렇게 해봐도 되겠습니까? (doegetseumnikka) — Is it going to work? Literally: 되겠습니까 is said 되겓씀니까.
• 진짜 너무한 거 아닙니까? (animnikka) — This is too much, isn't it? Literally: 아닙니까 is said 아님니까.
• 오늘 100회 특집 아닙니까? (animnikka) — Isn't today the 100th episode special? Literally: 아닙니까 is said 아님니까.
• 런닝맨 누가 만들었습니까? (mandeureotseumnikka) — Who made RunningMan? Literally: 만들었습니까 is said 만드럳씀니까.
• 저희 팀 뽑으신 거 아닙니까? (animnikka) — Didn't you pick our team? Literally: 아닙니까 is said 아님니까.
• 진짜니까 도망가지 않았을까요? (jinjjanikka) — She probably ran because hers worked.
• 아 과장에 대해서 아니까? (anikka) — Ah, because you know the manager pay?
• 그 말을 하지 않는다니까? (anneundanikka) — with his own mouth. Literally: 않는다니까 is said 안는다니까.
• 앞에 태극기 보이십니까~? (boisimnikka) — Do you see the Korean flag? Literally: 보이십니까 is said 보이심니까.
• 김치 맛있지? 김치 맛있다니까. (masitdanikka) — The kimchi tastes nice right? I told you. Literally: 맛있다니까 is said 마싣따니까.
• 이거 지금 까서 먹으면 됩니까? (doemnikka) — Can I peel this and eat this now? Literally: 됩니까 is said 됨니까.

Why it sounds harder than it looks

니까 attaching to a stem that ends in a consonant takes an extra 으 — 먹으니까, not 먹니까 — and the result is one syllable longer than learners expect.

More importantly, the sound shifts. 니까 already carries a tense consonant, and the ㄴ pulls on whatever precedes it, so a final ㄱ or ㅂ turns nasal before you get to the ending.

That is why 좋으니까 does not sound the way it looks, and why learners often fail to recognise spoken 니까 despite reading it comfortably. We wrote about the pattern in words that sound nothing like they look.

The romanization beside each example is the actual pronunciation rather than a transliteration of the spelling, so you can see the gap directly.

How to practise it

Do not start by producing it. Start by noticing which half of the sentence is doing the justifying.

In the examples below, cover the first clause and read only the second. If it is a request, a suggestion, or a conclusion, you have found the 니까 use — and you have found the rule at the same time.

When you do start producing, the safest entry point is exactly that pattern: a reason, then a suggestion. It's late, 니까, let's go. That sentence shape is common, unambiguous, and impossible to get wrong once the rule is in place.

Save the discovery use for later. It is easy to recognise and easy to overuse, and using it where a plain past tense would do makes a story sound more dramatic than it was.

Where these examples came from

These lines come from clip scripts we wrote for our shadowing tool — Korean variety episodes and self-produced idol content, transcribed line by line with our own English rendering.

One pattern in the data is worth stating. The polite question form is markedly rarer than the others, which is not an artefact of our filtering: a reason offered as grounds tends to be stated rather than asked, and asking about someone else's grounds politely usually takes a different construction entirely.

Lines were kept short so the ending stays the thing you notice.

FAQ

What does 니까 mean? Because — but specifically as grounds for what the speaker is about to say, ask, or suggest. It also has a second use meaning upon doing something, I found that….

What is the difference between 니까 and 아서/어서? 니까 gives grounds, 아서/어서 gives cause. Commands and suggestions require 니까, and using 아서 there is grammatically wrong, not merely unnatural.

Can I use 니까 with the past tense? Yes, and this is one of the practical differences from 아서/어서, which cannot carry a past marker before it.

Why is it sometimes 으니까? After a stem ending in a consonant, 으 is inserted — 먹으니까, 좋으니까. After a vowel it is just 니까.

Why does spoken 니까 sound different from the spelling? The ㄴ pulls on the consonant before it and the ending already carries a tense consonant, so the syllables reshape. The romanization beside each example shows what actually comes out.