가 그런

is like that; such

→ 가
phrase Common #2,991
is like that; such 가 marks the preceding noun as the subject, and 그런 means “like that” or “such.” The exact translation depends on what follows.
KO: 종교가 그런 거라 생각하나?
EN: Do you think religion is like that?

조가 그런 미친놈은 왜 고용한 거 야?

Why did Joe hire such a crazy guy?

— 저수지의 개들 (1992)

하지만 모든 택시 운전사가 그런 건 아니야

But not all taxi drivers are like that.

— 택시 (1998)

크리스가 그런 일을 하고 있는 줄은 몰랐다.

I didn't know Chris was doing that.