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행세를

act like; pose as

→ 행세
phrase Rare #26,621
act like; pose as Usually followed by 하다. It can mean pretending to be someone or acting as though you have a particular role or status.
KO: 그는 경찰 행세를 했어요.
EN: He pretended to be a police officer.

그래서 다른 사람 행세를 한 거 야

So you pretended to be someone else.

— RRR: 라이즈 로어 리볼트 (2022)