을 잘못

… incorrectly; the wrong …

→ 을

phrase Uncommon #12,779

… incorrectly; the wrong … Follows a noun marked with the object particle 을, often to say that you chose, used, or did something with the wrong thing.

KO: 길을 잘못 들었어요.

EN: I took the wrong road.

로렌스, 날을 잘못 잡았어

Lawrence, you picked the wrong day.

— 로렌스 애니웨이 (2012)