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잘해야

must do well, must treat someone well

→ 잘하다
잘 well + 해야 do; perform
verb Rare #21,990
must do well, must treat someone well The exact meaning depends on context: it can mean doing something well or behaving well toward someone.
KO: 손님이 오면 잘해야 해요.
EN: You should treat the guests well when they come.
Conjugation of 잘하다
Conditional
잘하면잘해야

잘해야 돼요, 응?

You have to do well, okay?

— Miracle in Cell No. 7 (2013)

예, 잘해야 돼요

Yes, I have to do well.

— Miracle in Cell No. 7 (2013)

손님 오면 잘해야 한다

You have to treat guests well when they come over.

— 인생은 아름다워 (1997)

잘해야 한다

You have to do well.

— 페인 앤 글로리 (2019)