“Molla” (몰라) — “I don’t know,” and “I’m not talking about it”

Short version: 몰라 is the casual “I don’t know,” from 모르다. But tone changes it completely. Said flatly, it’s information. Said with a pout, it’s “Figure it out yourself.” Thrown over the shoulder, it’s “I’m done with this conversation.” And there’s a real difference between 몰라 and 모르겠어: one states a fact, the other admits you can’t tell.

What the subtitle saysI don’t know.

What was actually said몰라! — ‘Forget it, I’m not talking about it.’ (She knows exactly what’s wrong.)

The forms

Form	Level	Feel
몰라	Casual	I don’t know / dunno
몰라요	Polite	I don’t know (can sound blunt)
모르겠어 / 모르겠어요	Casual / polite	I’m not sure, I can’t tell
잘 모르겠습니다	Formal	I’m afraid I don’t know
나도 몰라	Casual	Don’t ask me / no idea

The –겠– in 모르겠어요 softens things. It frames the answer as “I can’t tell” rather than a flat “I don’t know.” That’s why 잘 모르겠습니다 is the standard answer at work, in class or in customer service, and why a bare 몰라요 to a teacher can sound like a sulky teenager.

The sulky 몰라

A partner asks “What’s wrong?” The answer is 몰라. That means: something is wrong, you should know what it is, and I’m not going to spell it out. Romance dramas run on this exchange. Sometimes it’s 몰라 몰라, with a turned back, which adds “and stop asking.”

The giving-up 몰라

몰라, 몰라 — “Whatever. I give up.” Pushing the homework away at midnight.
몰라, 그냥 먹자 — “Who cares, let’s just eat.”
나도 몰라 — “Your guess is as good as mine.”

Here 몰라 means you’ve stopped trying to know. It’s surrender, often cheerful.

The teasing 몰라

Drawn out with a smile — 몰라~ — it’s playful: “Wouldn’t you like to know?” Said by someone hiding a surprise, it’s practically a confession that there is one.

Where the word comes from

모르다 is native Korean, “to not know,” and it’s worth noticing that it exists at all. Korean has a separate verb for not knowing instead of putting “not” in front of “know.” The opposite of 알다 (“to know”) is 모르다, and you can’t say 안 알아. In the same way, 없다 (“to not exist, not have”) is the opposite of 있다.

The spelling follows a predictable pattern that textbooks call the 르-irregular: verbs whose stem ends in 르 double the ㄹ before –아/-어. So 모르 + 아 becomes 몰라, just as 빠르다 (“fast”) gives 빨라.

For learners: in class, at work, or with anyone older, say 잘 모르겠어요 or 잘 모르겠습니다. Save 몰라 for friends — and remember that, said the wrong way, even a friend will hear “leave me alone.”

What subtitles do

“I don’t know.” The words are right; the sulk isn’t always. English “I don’t know” can be sulky too, but it reads as genuine confusion unless the actor sells it hard. And the difference between a polite 모르겠어요 and a blunt 몰라요 — the difference between a careful employee and a defiant one — becomes the same three words.