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알고 있었던

had known

→ 알다
phrase Rare #23,133
had known Describes something someone knew or was aware of in the past. Often comes before a noun or 것/거.
KO: 그는 그 사실을 알고 있었던 사람이에요.
EN: He was someone who had known that fact.

그리고 너도 알고 있었던 거 같아.

And I think you knew that too.

— 해리 포터와 죽음의 성물 2 (2011)

그리고 걔는 처음부터 다 알고 있었던 거 같아요

And I think they knew everything from the start.

— The Great Flood (2025)

아마도 알고 있었던 거 같아.

I think I probably knew.

— 해리 포터와 죽음의 성물 2 (2011)

알고 있었던 거 아니야?

Didn't you already know?

— Officer Black Belt (2024)