Remembering & Witnessing: -더- - Korean Intermediate (B1-B2)

You've just come back from a weekend in Busan, and a friend asks how it was. In English you'd say "The sea was so blue, and the people were really friendly." A Korean speaker will very likely say:

Korean	English
바다가 정말 파랗더라고요. 사람들도 친절하더라고요.	The sea was really blue, I found. And the people were friendly, I noticed.

That little -더- doesn't really mean "was". It means "I saw this for myself back then, and I'm bringing it back to you." -더- is one of the hardest items at TOPIK level 4 because English has nothing like it. It's also one of the most useful for sounding natural when you share experiences, give reviews and tell stories. This lesson covers the whole -더- family: -더라고요, -던데요, the modifier -던, and the connectors -더니 and -았더니.

🧠 The Mental Model: Rewinding the Camera

Imagine you wore a body camera yesterday. -더- means: rewind to that moment and replay what the camera recorded. Three conditions come with it:

✅ The Three Conditions of -더-

1. You perceived it yourself. You saw, heard, tasted or felt it. It isn't hearsay (for that you have -대요, Lesson 3) and it isn't general knowledge.

2. The perceiving happened in the past. You're reporting from a memory. For something you're noticing right now, use -네요.

3. You took it in as an observer. The information came to you: something you noticed or found out, not something you deliberately did. This is where the famous first-person restriction comes from (below).

The tense before -더- is the tense at the moment you were watching, not the tense relative to now:

Korean	What the camera recorded	English
가게에 갔는데 직원들이 문을 닫더라고요.	The action in progress: they were closing up as I watched.	When I got to the shop, the staff were closing up.
가게에 갔는데 벌써 문을 닫았더라고요.	The action already completed: the shop was already shut.	When I got to the shop, it had already closed.
하늘을 보니까 곧 비가 오겠더라고요.	What it looked like was coming.	Looking at the sky, it seemed it would rain soon.

🗂️ The -더- Family at a Glance

Form	Where you use it	Example
-더라고요	Polite conversation: "I noticed / I found"	그 식당 진짜 맛있더라고요.
-더라	반말, and 한다체 narrative	그 식당 진짜 맛있더라.
-더군요 / -더군	A bit formal or reflective: "I see that it was…"	그분은 한국어를 아주 잘하시더군요.
-던데요 / -던데	Observation that leaves room for a reaction; soft contradiction	생각보다 싸던데요?
-던	Noun modifier: "that used to… / that was …ing"	제가 자주 가던 카페
-더니	Connector: I observed A, then B (someone else)	아침에는 맑더니 오후에 비가 왔어요.
-았더니	Connector: I did A, and found or got B	창문을 열었더니 시원했어요.

Formation is easy: -더- attaches straight to any stem, with no vowel harmony and no 받침 changes. 가더라고요, 먹더라고요, 춥더라고요, 만들더라고요. It also combines with -시-, -았- and -겠-: 가시더라고요, 갔더라고요, 가겠더라고요. With nouns, use 이더라고요 (학생이더라고요). After a vowel the 이 usually drops in speech: 의사더라고요.

👀 -더라고요: Sharing What You Found

-더라고요 is the conversational workhorse. It presents something you experienced as new information for the listener, and it invites them to react. It's the natural form for reviews, travel stories and reporting on people you've seen.

Korean	English
새로 생긴 빵집에 가 봤는데 크루아상이 정말 맛있더라고요.	I tried the new bakery, and the croissants were really good.
민수 씨를 오랜만에 봤는데 살이 많이 빠졌더라고요.	I saw Minsu for the first time in ages, and he'd lost a lot of weight.
한국은 겨울에 생각보다 훨씬 춥더라고요.	Winter in Korea turned out to be much colder than I expected.
회의실에 가 보니까 아무도 없더라고요.	I went to the meeting room, and there was nobody there.
뉴스 보니까 내일부터 장마가 시작된다고 하더라고요.	I saw on the news that the rainy season starts tomorrow.

The last example is interesting. A forecast is hearsay, so why is -더- allowed? Because -더- is attached to 하다: what you personally witnessed is the news saying it. -다고 하더라고요 ("I heard it said") is very common.

Which one? Four ways to talk about the same café

Korean	What it signals
그 카페 조용했어요.	A plain past fact. Neutral, and it says nothing about how you know.
그 카페 조용하더라고요.	I was there, and I found it quiet. Shared as a discovery.
(sitting in it) 이 카페 조용하네요.	I'm noticing it right now.
그 카페 조용하대요.	Someone told me it's quiet. Hearsay.

🙋 The First-Person Restriction, and Its Exceptions

Condition 3 (you take the information in as an observer) produces the most famous rule about -더-. Read this section carefully, because learners either ignore the rule or over-apply it.

🚫 The Rule

In a statement ending in -더- (-더라고요, -더라, -더군요, -던데요), the speaker can't be the subject of their own deliberate action.

✗ 저는 어제 도서관에 가더라고요. ✗ 제가 김치찌개를 만들던데요.

Why? You don't "observe" your own choices as news. You already knew you were going to the library. Just say 저는 어제 도서관에 갔어요.

💡 Exception 1: Your Own Feelings and Sensations

When the predicate describes your inner experience (an emotion, a bodily sensation, or how something struck you), first person is not just allowed, it's the natural subject. Your feelings are something you "take in".

저는 그 영화가 너무 슬프더라고요 — "I found that film so sad."

등산하고 나니까 다리가 아프더라고요 — "After the hike, my legs were aching."

저한테는 좀 맵더라고요 — "It was a bit spicy for me."

The mirror image: you can't directly perceive someone else's feelings, so ✗ 민수 씨가 슬프더라고요 sounds odd. Report what you could see instead: 민수 씨가 슬퍼하더라고요 ("Minsu was grieving") or 민수 씨가 슬퍼 보이더라고요 ("Minsu looked sad").

💡 Exception 2: Discovering Something About Yourself

When you see yourself from the outside, as something that happened without your deliberate control and that surprised you, first person becomes possible, because you really are an observer now:

꿈에서 제가 하늘을 날고 있더라고요 — "In my dream, I was flying."

사진을 보니까 제가 눈을 감고 있더라고요 — "Looking at the photo, I saw I had my eyes shut."

정신을 차려 보니 제가 병원에 누워 있더라고요 — "When I came to, I was lying in a hospital."

막상 해 보니까 제가 요리를 꽤 잘하더라고요 — "When I actually tried, it turned out I'm pretty good at cooking."

An honest note: linguists describe the exact edges of this rule in slightly different ways, and native speakers' judgments on borderline sentences vary. The core is solid, though. No -더- for your own deliberate actions. Yes for your feelings and sensations, and for surprising, uncontrolled discoveries about yourself. The restriction applies to sentence endings and to -더니. The modifier -던 is free of it: 제가 다니던 학교 ("the school I used to attend") is perfectly normal.

💭 -던데요: "I Noticed… (So?)"

-던데요 is -더- + -ㄴ데요 (Lesson 5). You report what you saw and leave the sentence open for the listener. That makes it perfect for gently disagreeing, offering an observation, or hinting.

Speaker	Korean	English
A	그 식당 비싸죠?	That restaurant's expensive, right?
B	아니요, 생각보다 싸던데요.	No, it was cheaper than I expected, actually.
A	민수 씨 오늘 안 왔죠?	Minsu didn't come in today, did he?
B	아까 사무실에 왔던데요?	He was in the office earlier, though (I saw him).
A	이 옷 좀 이상하지 않아요?	Doesn't this outfit look a bit odd?
B	저는 괜찮던데요.	I thought it looked fine.

Notice 저는 괜찮던데요: first person, allowed, because it's your impression (Exception 1). In 반말 it's -던데: 아까 왔던데? The casual question 어떻던데? ("So how was it?") asks about the listener's experience. In questions, -더- points at what the listener witnessed.

🔗 The Modifier -던: -(으)ㄴ vs -던 vs -았던

You already know -(으)ㄴ as the past modifier for verbs (먹은 빵, "the bread I ate"). -던 and -았던 add the "rewind" feeling of -더-. Here's the three-way contrast with one verb:

Form	Korean	English	Meaning
-(으)ㄴ	먹은 빵	the bread (I) ate	A completed action, full stop.
-던	먹던 빵	the bread (I) was eating	Interrupted or unfinished: half-eaten bread left on the table.
-았던	먹었던 빵	the bread (I) ate (back then)	Completed in the past and recalled: "that bread I had that time".

Korean	English	Why this form
제가 마시던 커피 누가 버렸어요?	Who threw away the coffee I was drinking?	-던: unfinished
여기가 제가 매일 다니던 학교예요.	This is the school I used to go to every day.	-던: past habit
작년 여름에 갔던 바닷가에 다시 가고 싶어요.	I want to go back to the beach we went to last summer.	-았던: completed once, recalled
어제 산 책을 벌써 다 읽었어요.	I already finished the book I bought yesterday.	-(으)ㄴ: simple completed action
언니가 입던 옷을 물려받았어요.	I got my sister's hand-me-downs (the clothes she used to wear).	-던: worn repeatedly, used

With adjectives and 이다, -(으)ㄴ is present (예쁜 = "pretty"), so to talk about a past state you must use -던 or -았던: 그렇게 조용하던 / 조용했던 동네가 지금은 시끄러워요 ("The neighbourhood that used to be so quiet is noisy now"), 대학생이었던 시절 ("my university days"). For adjectives, -던 and -았던 are close to interchangeable. -았던 underlines a little more strongly that the state is over.

For habits, 자주 가던 곳 and 자주 갔던 곳 are both common, and native speakers often use them interchangeably. -던 paints the habit as an ongoing stretch of the past. -았던 looks back on it as finished. If you're unsure, remember the clear cases: unfinished → -던, one completed occasion recalled → -았던.

🎬 -더니 and -았더니: Stories With a Twist

These two connectors look almost the same but point in opposite directions. -더니 is about someone else you watched. -았더니 is about what you did and what you found as a result.

-더니: I watched A happen, then B

Use	Korean	English
Contrast or change	아침에는 날씨가 맑더니 오후에는 비가 쏟아졌어요.	It was clear in the morning, but in the afternoon it poured.
Cause → result	민수 씨가 매일 연습하더니 결국 대회에서 1등을 했어요.	Minsu practised every day, and in the end he won first prize.
One action, then another	친구가 편지를 읽더니 갑자기 울기 시작했어요.	My friend read the letter and suddenly started crying.

Restrictions: the first clause is normally about someone or something other than the speaker (✗ 제가 열심히 공부하더니 합격했어요). The two clauses usually share the same subject or topic. The second clause is a statement, never a command or suggestion.

-았더니: I did A, and found or got B

Use	Korean	English
Discovery	집에 갔더니 아무도 없었어요.	When I got home, nobody was there.
Result	약을 먹었더니 열이 내렸어요.	I took the medicine, and my fever went down.
Result	오랜만에 운동했더니 온몸이 아파요.	I exercised for the first time in ages, and now I ache all over.
Someone's response	친구한테 물어봤더니 자기도 모른대요.	I asked a friend, and she said she doesn't know either.

With -았더니, the first clause is normally the speaker's own action, or the viewpoint character's action in a story. The second clause is what that action led to or revealed.

	-더니	-았더니
Clause 1 subject	Someone or something the speaker observed (usually not "I")	Usually the speaker ("I")
Meaning	I saw A, then (contrast / result / next action) B	I did A, and discovered or got B
Example	민수가 창문을 열더니 소리를 질렀어요. Minsu opened the window and shouted.	제가 창문을 열었더니 눈이 오고 있었어요. I opened the window and found it was snowing.

You met a similar pattern at A2: 집에 가니까 아무도 없었어요. For discoveries, -(으)니까 and -았더니 overlap almost completely. -았더니 sounds a little more like storytelling, and it's the more natural choice for "I did X, and as a result Y" (약을 먹었더니 나았어요).

💬 Dialogue: Back From Gyeongju

Speaker	Korean	English
태민	은지 씨, 경주 여행은 어땠어요?	Eunji, how was your trip to Gyeongju?
은지	정말 좋았어요! 불국사가 사진에서 보던 것보다 훨씬 크더라고요.	It was great! Bulguksa was much bigger than it looked in the photos I'd seen.
태민	그래요? 저는 중학교 때 수학여행으로 갔던 기억밖에 없어요.	Really? All I remember is going there on a middle-school trip.
은지	밤에는 동궁과 월지에 갔는데 야경이 진짜 예쁘더라고요. 근데 사람도 엄청 많던데요.	At night we went to Donggung Palace and Wolji Pond, and the night view was so pretty. There were loads of people, though.
태민	요즘 텔레비전에도 자주 나오더라고요. 그래서 그런지 인기가 많은 것 같아요.	I've noticed it's on TV a lot lately. Maybe that's why it's so popular.
은지	맞아요. 그런데 첫날은 날씨가 좋더니 둘째 날에는 하루 종일 비가 왔어요.	Right. The weather was nice on the first day, but on the second day it rained all day.
태민	아이고, 그럼 구경을 많이 못 했겠네요.	Oh no, so you probably couldn't see much.
은지	아니요, 오히려 좋았어요. 비를 피하려고 황리단길에 있는 한옥 카페에 들어갔더니 창밖 풍경이 정말 운치 있더라고요.	No, it was actually better. We ducked into a hanok café on Hwangridan-gil to get out of the rain, and the view out the window was really atmospheric.
태민	사진 있어요? 좀 보여 주세요.	Do you have photos? Show me.
은지	여기요. 근데 집에 와서 보니까 제가 사진마다 눈을 감고 있더라고요.	Here. But when I looked at them at home, I had my eyes closed in every single one.
태민	하하, 그래도 분위기는 잘 나왔네요. 황남빵도 먹어 봤어요?	Haha, but the atmosphere came out well. Did you try Hwangnam bread?
은지	그럼요. 저한테는 좀 달더라고요. 그래도 따뜻할 때 먹으니까 맛있었어요.	Of course. It was a bit sweet for me. But it was tasty eaten warm.
태민	어렸을 때 먹던 그 맛이 그립네요. 다음 달에 저도 한번 가 봐야겠어요.	I miss that taste I used to have as a kid. I should go myself next month.

Every -더- in Eunji's lines is either something she observed (크더라고요, 예쁘더라고요, 많던데요), her own sensation (저한테는 좀 달더라고요, Exception 1), or a surprising discovery about herself (제가 눈을 감고 있더라고요, Exception 2). She never says ✗ 제가 카페에 들어가더라고요. For her own deliberate action she uses 들어갔더니, which is exactly the job of -았더니.

📰 Reading: My Old Neighbourhood

A short personal essay in 한다체. Notice how -던, -았던, -더-, -더니 and -았더니 each do a different job in the memory.

수필
지난 주말, 10년 만에 어릴 때 살던 동네에 가 보았다. 내가 매일 다니던 초등학교는 그대로였지만, 친구들과 떡볶이를 사 먹던 분식집은 사라지고 그 자리에 카페가 들어서 있었다. 골목도 생각보다 훨씬 좁더라. 어릴 때는 그렇게 넓어 보이던 운동장이 지금 보니 작은 마당 같았다. 옛날 우리 집 앞에 갔더니 낯익은 할머니 한 분이 앉아 계셨다. 옆집 할머니였다. 할머니는 나를 한참 쳐다보시더니 "네가 그 꼬마구나!" 하며 웃으셨다. 할머니의 얼굴에는 주름이 많이 늘었지만 웃음소리는 예전 그대로였다.

수필

지난 주말, 10년 만에 어릴 때 살던 동네에 가 보았다. 내가 매일 다니던 초등학교는 그대로였지만, 친구들과 떡볶이를 사 먹던 분식집은 사라지고 그 자리에 카페가 들어서 있었다. 골목도 생각보다 훨씬 좁더라. 어릴 때는 그렇게 넓어 보이던 운동장이 지금 보니 작은 마당 같았다. 옛날 우리 집 앞에 갔더니 낯익은 할머니 한 분이 앉아 계셨다. 옆집 할머니였다. 할머니는 나를 한참 쳐다보시더니 "네가 그 꼬마구나!" 하며 웃으셨다. 할머니의 얼굴에는 주름이 많이 늘었지만 웃음소리는 예전 그대로였다.

✏️ Practice

Exercise 1 — Share what you found: -더라고요

제주도에 가 봤는데 바다가 정말 _____ (맑다) (Answer: 맑더라고요)
어제 그 식당에 갔는데 사람이 너무 _____ (많다) (Answer: 많더라고요)
아까 창밖을 보니까 눈이 _____ (오다 — it was snowing as I watched) (Answer: 오더라고요)
가게에 가 봤는데 벌써 문을 _____ (닫다 — already closed by the time I got there) (Answer: 닫았더라고요)
저는 그 영화가 좀 _____ (무섭다 — my own feeling) (Answer: 무섭더라고요)
사진을 보니까 제가 눈을 _____ (감다 + -고 있다 — surprising discovery about myself) (Answer: 감고 있더라고요)

Exercise 2 — -(으)ㄴ, -던 or -았던?

제가 _____ 빵 누가 먹었어요? (먹다 — I was eating it and hadn't finished) (Answer: 먹던)
이곳은 제가 어렸을 때 매일 _____ 놀이터예요. (가다 — past habit, -던) (Answer: 가던)
작년 여름에 한 번 _____ 바닷가에 다시 가 보고 싶어요. (가다 — one completed visit, recalled) (Answer: 갔던)
어제 다 _____ 책을 친구에게 빌려줬어요. (읽다 — simple completed action) (Answer: 읽은)
그렇게 _____ 동네가 지금은 너무 시끄러워요. (조용하다 — past state, -았던) (Answer: 조용했던)
대학생_____ 시절이 그리워요. (이다 + -았던) (Answer: 이었던)
할아버지가 _____ 안경을 아직 가지고 있어요. (쓰다 — used habitually, honorific -시- + -던) (Answer: 쓰시던)

Exercise 3 — Reply with -던데요

A: 민수 씨 오늘 안 왔죠? B: 아까 사무실에 _____ (오다 — I saw he had come) (Answer: 왔던데요)
A: 그 식당 비싸요? B: 아니요, 생각보다 _____ (싸다) (Answer: 싸던데요)
A: 이 옷 좀 이상하죠? B: 아니요, 저는 _____ (괜찮다 — my impression) (Answer: 괜찮던데요)
A: 수진 씨 어디 갔어요? B: 아까 가방을 들고 _____ (나가다 — I saw her leaving) (Answer: 나가던데요)
A: 그 영화 재미없대요. B: 그래요? 저는 _____ (재미있다 — my impression) (Answer: 재미있던데요)

Exercise 4 — -더니 or -았더니?

아침에는 날씨가 _____ 오후에는 비가 왔어요. (맑다) (Answer: 맑더니)
민수 씨가 매일 _____ 결국 시험에 합격했어요. (연습하다 — I watched him do it) (Answer: 연습하더니)
제가 창문을 _____ 시원한 바람이 들어왔어요. (열다 — my own action) (Answer: 열었더니)
친구한테 _____ 자기도 모른대요. (물어보다 — my own action) (Answer: 물어봤더니)
동생이 편지를 _____ 갑자기 울기 시작했어요. (읽다 — I watched) (Answer: 읽더니)
오랜만에 등산을 _____ 다리가 너무 아파요. (하다 — my own action) (Answer: 했더니)
동생은 어릴 때 채소를 _____ 지금은 제일 좋아해요. (싫어하다 — observed change) (Answer: 싫어하더니)

Exercise 5 — Reading comprehension

글쓴이는 _____ 만에 어릴 때 살던 동네에 갔다. (Answer: 10년|십년)
친구들과 떡볶이를 사 먹던 분식집 자리에는 지금 _____가 있다. (Answer: 카페)
어릴 때 넓어 보이던 _____이 지금은 작은 마당 같았다. (Answer: 운동장)
옛날 집 앞에 _____ 옆집 할머니가 앉아 계셨다. (가다 — the connector used in the essay) (Answer: 갔더니)
할머니는 글쓴이를 한참 _____ 웃으셨다. (쳐다보다 — honorific + the connector used in the essay) (Answer: 쳐다보시더니)

🧠 Check Your Understanding

⚠️ Common Mistakes

✗ 저는 주말에 친구를 만나더라고요. → ✓ 저는 주말에 친구를 만났어요. (No -더- for your own deliberate actions.)

✗ (only heard about it from a friend) 그 식당 맛있더라고요. → ✓ 그 식당 맛있대요. (-더- needs your own experience. Hearsay takes -대요.)

✗ 여자 친구가 기쁘더라고요. → ✓ 여자 친구가 기뻐하더라고요. (For other people's feelings, report what you could see.)

✗ 제가 열심히 공부하더니 합격했어요. → ✓ 열심히 공부했더니 합격했어요. (Your own action → -았더니.)

✗ 어렸을 때 예쁜 누나 → ✓ 어렸을 때 예뻤던 누나. (-(으)ㄴ on an adjective is present. A past state needs -던 or -았던.)

✗ Writing 맛있더라구요 in formal text → ✓ 맛있더라고요. (-구요 is only the spoken pronunciation.)

-더- is the item that makes even strong intermediate learners hesitate, and many plateau here for a while. That's normal, not a sign that you've hit your limit. The best way forward is listening: notice every -더라고요 in a drama or a YouTube vlog and ask "what did they see?" Before long the first-person rule will feel less like a rule and more like common sense.

❓ Common Questions

🌟 Going Further

Challenge 1: Write a 6–8 sentence review of a place you've visited in 해요체, using -더라고요 at least three times (including once about your own feelings), -던데요 once, and -았더니 once. Then check every -더- against the three conditions.

Challenge 2 (TOPIK style): In 200–300 characters of 한다체, write about a place from your childhood that has changed. Use -던, -았던, -더라 and -더니 at least once each, following the model essay.

🔮 Looking Ahead

-더- looked back at what really happened. Lesson 18: Hypotheticals & Regret looks at what didn't happen, or might: -다면 ("if it were the case that…"), -(으)ㄹ 텐데 ("it would…"), and the regret form -았더라면 ("if only I had…"), which, as you'll notice, still carries a trace of the -더- you've just learned.

🇰🇷 Lesson 17: Remembering & Witnessing: -더-