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잘 못해요

am not good at

→ 잘
phrase Uncommon #12,751
am not good at Used to say that someone is not skilled at an activity. The spacing distinguishes it from 잘못해요, meaning “do something wrong.”
KO: 저는 요리를 잘 못해요.
EN: I'm not good at cooking.

난 그런 거 잘 못해요

I'm not very good at that.

— 엘 시크레토: 비밀의 눈동자 (2009)