결혼한 거

being married

→ 결혼하다
phrase Uncommon #8,271
being married 거 is a colloquial form of 것, referring here to the fact or state of being married.
KO: 너 결혼한 거 맞아?
EN: Are you really married?

진짜 결혼한 거 맞아?

Are you really married?

— 아노라 (2024)

결혼한 거 아니었어요?

Weren't you married?

— 스틸 라이프 (2006)