같이 있던

who was with

→ 같이
phrase Rare #23,423
who was with Describes someone who was with another person or group in the past; the person or group is usually named after the phrase.
KO: 어제 민수랑 같이 있던 사람은 누구야?
EN: Who was the person with Minsu yesterday?

우린 같이 있던 시간보다 떨어져 있던 시간이 더 길어

We’ve spent more time apart than we ever did together.

— 눈 깜짝할 사이에 (2026)

같이 있던 그 신사는 누구 야?

Who was that gentleman you were with?

— 내 어머니의 모든 것 (1999)

같이 있던 춘성은 왜 안 돌아왔지?

Why didn't Chunseong, who was with them, come back?

— 인생 (1994)

찬드 나왑 이랑 같이 있던 놈 아니야?

Isn't that the guy who was with Chand Nawab?

— 카쉬미르의 소녀 (2015)