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사이였어요

were ... with each other

→ 사이
phrase Rare #30,923
were ... with each other Used after a word or phrase describing a relationship to say what people were to each other in the past.
KO: 우리는 학교 친구 사이였어요.
EN: We were school friends.

그녀하고 무슨 사이 였어요?

What was your relationship with her?

— 스틸 라이프 (2006)

연인 사이 였어요?

Were you lovers?

— 더 립 (2026)

둘이 아는 사이 였어요?

Did you two know each other?

— No Other Choice (2025)