I have seen the -잖- infix in a lot of places, but I can't find any source that clearly defines what it means. Can anyone help me with this? Here are a few examples. 나 정말 아름답잖아? (After selecting Cassiopeia in the Korean League of Legends client.) 나는 지금 울잖아요. (From 난 알아요 by 서태지.) 혼자가 안이야. 넌 내가 있잖아. (From KWOW episode 53 on YouTube.) EDIT: I fixed the spelling error. I think I was confusing this infix with the word 괜찮아.