이었던

who was, that was

→ 이다
이 to be + 었 Past tense + 던 past attributive modifier
auxiliary · past tense Uncommon #6,768
who was, that was Used after a noun to describe someone or something in a past state or role.
KO: 저는 학생이었던 친구를 만났어요.
EN: I met a friend who was a student.
Conjugation of 이다

백인 이었던 거 알아

Did you know you were white?

— 폴링 다운 (1993)

얼마 동안 이었던 거 같아?

How long do you think it was?

— 엑소시스트: 믿는 자 (2023)

왜 여태까지 비밀 이었던 거 죠?

Why was it a secret until now?

— 콘클라베 (2024)

우리 박 부장 아버지가 그때 장군 이었던 거 알지?

You know Director Park’s father was a general back then, right?

— Good News (2025)

난 형님이 어떻게 될까 봐 그게 걱정 이었던 거 니까

Because I was worried about what might happen to you, hyung.

— I Saw the Devil (2010)

내 결정이 다 꽝 이었던 거 몰라서?

Didn't you know all my decisions were bad?

— 아틀란티스: 잃어버린 제국 (2001)

당신 일꾼 이었던 소년이 기억나요

Do you remember the boy who used to work for you?

— 프린세스 브라이드 (1987)

한때 사랑 이었던 추억 깊숙이 엄마 금방 올게

Deep in memories of what was once love—Mom, I’ll be back soon.

— 컨트롤 (2007)

함정 이었던 거 예요?

Was it a trap?

— 저수지의 개들 (1992)

그가 오직 노먼만 이었던 적은 없지만 오직 어머니만 이었던 경우는 많았죠

He was never just Norman, but there were many times when he was only a mother.

— 싸이코 (1960)

미국인을 찾고 있다 오늘 당신이 여기 서 만날 예정 이었던 남자 미국인 인 줄은 몰랐다

I'm looking for an American—the man you were supposed to meet here today. I didn't know he was American.

— 학살기관 (2017)

그 사람이 러시아인 이었던 게 우연 이었다고 생각해?

Do you think it was a coincidence that the person was Russian?

— 맥시멈 리스크 (1996)