사건은

the case

→ 사건
phrase Uncommon #14,326
the case 사건 means “case” or “incident,” and 은 marks it as the topic of the sentence.
KO: 그 사건은 아직 해결되지 않았어요.
EN: That case hasn’t been resolved yet.

브라질 매춘부 사건은 실수 였지?

Was the Brazilian prostitute case a mistake?

— 러브 액츄얼리 (2003)