셋을

three of them

→ 셋
phrase Rare #32,170
three of them 셋 means “three,” and 을 marks it as the object of the sentence. Depending on context, it can refer to three people or three things.
KO: 셋을 골랐어요.
EN: I chose three.

내가 셋을 셀 테니 하나, 둘, 셋!

I’ll count to three—one, two, three!

— 미인어 (2016)