-았/었더니

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Result of an action done in the past (when I did..., then...)

Examples

약을 먹었더니 나았어요.

After I took the medicine, I got better.

아침에 일찍 일어났더니 피곤해요.

I woke up early, and now I'm tired.

오랜만에 운동했더니 몸이 아파요.

I exercised after a long time, and now my body aches.

창문을 열었더니 시원해졌어요.

I opened the window, and it became cool.

커피를 많이 마셨더니 잠이 안 와요.

I drank a lot of coffee, and now I can't sleep.