오셨잖아요

came, remember?

→ 오다
오셨 Honorific past tense + 잖아 Reminding / shared knowledge + 요 Polite speech
verb · formal, past tense Rare #30,677
came, remember? Polite honorific form; 잖아요 reminds the listener of something presented as already known.
KO: 어제 여기 오셨잖아요.
EN: You came here yesterday, remember?
Conjugation of 오다

목요일에 오셨잖아요

You came on Thursday, remember.

— 파이트 클럽 (1999)

지금 막 오셨잖아요

You just got here.

— 반지의 제왕: 반지 원정대 (2001)

난 방금… 샬로 사부 아니죠 어제 회의 때 오셨잖아요

I just… You’re not Master Shallo, are you? You were at the meeting yesterday.

— 패왕별희 (1993)