그 짓을

that act

→ 그
phrase Rare #32,022
that act Often refers to a wrongful or disapproved-of act. 을 marks it as the object of a verb.
KO: 다시는 그 짓을 하지 마.
EN: Don’t do that again.

“설마 그 짓을 하려는 건 아니지?”

You’re not seriously thinking of doing that, are you?

알다시피 그 짓을 했지

As you know, I did it.

— 퍼니 게임 (1997)