English lumps a lot of small conversational reactions under three words — "oh," "right," and "well." Korean carves that space up more finely. This page teaches three fixed reaction phrases you will hear constantly, and the crucial point is that each makes a different interactional move: 그렇구나 receives new information, 그러게요 aligns with a shared feeling, and 글쎄요 declines to commit. Learn them as ready-made chunks, but learn the move each one makes — pick the wrong one and you will sound like you misheard.
Each phrase is grown from a pro-verb — 그렇다 ("to be so") or 그러다 ("to do/be so") — plus a sentence ending, so the grammar itself explains the nuance. The endings themselves are covered elsewhere (-군요/-구나, agreement backchannels); here we treat all three as lexical formulae you deploy whole.
그렇구나 / 그렇군요 — "oh, I see" (receiving new information)
그렇구나 is 그렇다 + the realization ending -구나, which marks information you have just grasped. You say it when something clicks — when a fact lands that you did not have a second ago. The polite form is 그렇군요.
아, 그렇구나. 이제 이해했어.
a, geureokuna. ije ihaehaesseo
Oh, I see. Now I get it. (casual)
아, 그래서 어제 안 왔구나.
a, geuraeseo eoje an watguna
Oh, so that's why you didn't come yesterday. (casual)
두 분이 원래 친구셨군요.
du buni wollae chingusyeotgunyo
Oh, so you two were friends all along. (polite)
The tell is that the information is new to you. 그렇구나 responds to a revelation — a reason you didn't know, a fact you just learned. It is not for endorsing something you already felt.
그러게(요) — "I know, right" (aligning with a shared feeling)
그러게 is 그러다 + -게, and it does something 그렇구나 cannot: it agrees with a feeling the two of you already share, conceding that the other person is right. It is the Korean "I know, right" / "tell me about it" / "you said it."
요즘 진짜 덥다. — 그러게, 너무 덥다.
yojeum jinjja deopda. — geureoge, neomu deopda
It's so hot lately. — I know, right, it's too hot. (casual)
그러게요, 저도 딱 그 생각했어요.
geureogeyo, jeodo ttak geu saenggakaesseoyo
Right, I was thinking exactly that. (polite)
There is a second, sharper use worth knowing: 그러게 can preface an "I told you so." When someone ignored your warning and it went wrong, 그러게 means "see? that's what I was saying."
그러게 내가 조심하라고 했잖아.
geureoge naega josimharago haetjana
See, I told you to be careful. (casual, mildly scolding)
And a fixed intensifier you will hear everywhere: 그러게 말이에요 (casual 그러게 말이야), literally "that's what I'm saying" — an emphatic "I completely agree / tell me about it."
사람이 너무 많네요. — 그러게 말이에요.
sarami neomu manneyo. — geureoge marieyo
There are so many people. — Tell me about it. (polite)
글쎄(요) — "well… / I'm not sure" (declining to commit)
글쎄요 (casual 글쎄) is a non-committal hedge. It withholds commitment: you use it to dodge a question, express doubt, or stall while you decide. Crucially, it is not agreement — it signals reservation.
이거 맞아요? — 글쎄요, 잘 모르겠어요.
igeo majayo? — geulsseyo, jal moreugesseoyo
Is this right? — Hmm, I'm not sure. (polite)
내일 올 수 있어요? — 글쎄요, 한번 볼게요.
naeil ol su isseoyo? — geulsseyo, hanbeon bolgeyo
Can you come tomorrow? — Well… I'll see. (polite, non-committal)
글쎄, 그건 좀 아닌 것 같은데.
geulsse, geugeon jom anin geot gateunde
Hmm, I don't think that's quite right. (casual, gentle disagreement)
Because it is a hedge, 글쎄요 is also how you politely disagree or decline without a flat "no." A Korean who answers your enthusiastic 괜찮죠? ("it's fine, right?") with a drawn-out 글쎄요… is not saying yes — they are quietly signaling doubt.
The three moves side by side
| Phrase | Move | Use it when… |
|---|---|---|
| 그렇구나 / 그렇군요 | learning | you just took in new information ("oh, I see") |
| 그러게 / 그러게요 | aligning | you agree with a feeling you already shared ("I know, right") |
| 글쎄 / 글쎄요 | hedging | you won't commit — doubt, dodge, or soft "no" ("well…") |
Run one exchange through all three. A friend says 오늘 날씨 진짜 좋다 ("the weather's great today"). If it is a shared observation you both feel, you align: 그러게. If they then tell you 사실 나 오늘 소풍 가 ("actually I'm going on a picnic"), which is news, you receive it: 아, 그렇구나. And if they ask 너도 갈래? ("wanna come?") and you are unsure, you hedge: 글쎄… The choice is not about politeness — it is about which conversational move you are making.
Why English speakers get this wrong
Two errors dominate. First, using 그렇구나 to a superior. The plain -구나 base is intimate, so answering your boss's explanation with 아, 그렇구나 sounds jarringly casual. Go 그렇군요 or 그러시군요. Second, reading 글쎄요 as agreement. Because it often follows a question and precedes a pause, learners hear it as a mild "yes." It is the opposite: 글쎄요 marks that you are not on board yet. Treating a Korean's 글쎄요 as consent is a real source of crossed wires.
Common Mistakes
❌ (부장님께) 아, 그렇구나.
Incorrect to a superior — the plain -구나 base is intimate; use 군요/시군요.
✅ (부장님께) 아, 그러시군요.
a, geureosigunyo
Oh, I see, sir. (polite, honorific)
❌ 괜찮죠? — 글쎄요!
Incorrect if you read the reply as agreement — a 글쎄요 answer signals doubt/reservation, not 'yes, it's fine'.
✅ 괜찮죠? — 네, 괜찮아요.
gwaenchancho? — ne, gwaenchanayo
It's fine, right? — Yes, it's fine. (if you actually mean yes)
❌ 오늘 진짜 덥다. — 그렇구나.
Odd — this is a shared feeling you both sense, so align with 그러게, not 그렇구나 (which is for NEW info).
✅ 오늘 진짜 덥다. — 그러게.
oneul jinjja deopda. — geureoge
It's really hot today. — I know, right. (casual)
❌ 나 어제 회사 그만뒀어. — 그러게.
Odd — this is brand-new information, so receive it with 그렇구나/그랬구나, not 그러게 (which implies you already shared the sentiment).
✅ 나 어제 회사 그만뒀어. — 아, 그랬구나.
na eoje hoesa geumandwosseo. — a, geuraetguna
I quit my job yesterday. — Oh, I see. (casual)
For hedging opinions in full sentences — the pattern behind 글쎄요 — see 그런 것 같아요 · 잘 모르겠어요; for wrapping up a topic, 아무튼 · 어쨌든.
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Start learning Korean→Related Topics
- 그런 것 같아요 · 잘 모르겠어요: Softening and HedgingTOPIK 3 — The two workhorse hedges that make Korean opinions sound appropriately tentative — 그런 것 같아요 (I think so) and 잘 모르겠어요 (I'm not sure) — and why the hedge is politeness, not weakness.
- 아무튼 · 어쨌든: 'Anyway' and 'In Any Case'TOPIK 3 — The two topic-wrapping adverbs — 아무튼 (anyway, moving on) and 어쨌든 (in any case, regardless of what was said) — and the concessive -든 grammar frozen inside them.
- -군(요) / -구나: Realization Said AloudTOPIK 3 — The discourse use of -군요 and -구나 — a receipt-of-uptake token that tells the speaker 'I've taken that in', central to empathetic active listening in Korean.
- 그렇죠 / 맞아요 / 그러게(요): Agreeing and BackchannelingTOPIK 2 — The tokens that keep a Korean conversation flowing — 네, 그렇죠, 맞아요, 그러게요, 그러니까요 — and why staying silent while listening reads as cold.