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우리가 모르는

that we don't know

→ 우리
phrase Rare #16,202
that we don't know Used before a noun to describe something unknown to us. 우리가 means “we” or “us,” and 모르는 is the noun-modifying form of 모르다, “to not know.”
KO: 우리가 모르는 사실이 아직 많아요.
EN: There are still many facts that we don't know.

우리가 모르는 뭔가가 있어

There’s something we don’t know.

— 이중 배상 (1944)

우리가 모르는 무슨 얘기가 또 있다는 거 냐?

Is there something else we don't know about?

— 안드레이 루블료프 (1966)