거 아니었어

wasn't it that...?

→ 것
phrase Rare #18,022
wasn't it that...? A colloquial way to ask for confirmation about something believed or previously understood; often translates as “weren’t you...?” or “didn’t you...?” depending on the preceding verb or adjective.
KO: 오늘 시험 있는 거 아니었어?
EN: Wasn't there a test today?

그때 그거 정말 백광호 한테 미리 대사 연습 시킨 거 아니었어?

Wasn’t that you having Baek Gwang-ho rehearse his lines beforehand?

— 살인의 추억 (2003)

, 좋아하는 거 아니었어?

Hey, didn't you like rap?

— 걸리 보이 (2019)