은 그걸

as for [the topic], that (as the object)

→ 은

phrase Rare #20,345

as for [the topic], that (as the object) 은 marks the preceding noun as the topic, and 그걸 means “that” as the object of the sentence. This is a sentence fragment rather than a complete expression on its own.

KO: 윌은 그걸 알아?

EN: Does Will know that?

토마신은 그걸 건드린 적 없어

Thomasin has never touched it.

— 더 위치 (2016)

윌은 그걸 알아?

Does Will know that?

— 사랑해 줘 사랑해 줘 (2026)