거라서

because it is

→ 것
phrase Rare #23,204
because it is A colloquial form of 것이라서, used to give a reason. It can follow a noun or a phrase describing an event or situation.
KO: 처음 온 거라서 잘 몰라요.
EN: Because it’s my first time here, I don’t know much.

그냥 네가 다른 사람 거 라서.

It’s just because you belong to someone else.

— 씨너스: 죄인들 (2025)

몰래 나온 거 라서 서둘러 돌아가야 해요

I snuck out, so I have to hurry back.

— 인생 (1994)