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잘 안다

know well

→ 잘
phrase Rare #21,086
know well Used to say that you are very familiar with a person, place, fact, or situation. The form 안다 is informal and plain in style.
KO: 나는 이 동네를 잘 안다.
EN: I know this neighborhood well.

난 지미를 잘 안다

I know Jimmy well.

— 좋은 친구들 (1990)

나는 톰을 잘 안다.

I know Tom well.

너희들 감정이 어떤지 잘 안다

I know exactly how you guys feel.

— 와호장룡 (2000)