Days later and I reply, well better late than never.
Haha, if you haven't found it yet it's I remember... Yoseob sings in it~! :D
(Yoseob's my bias, too! ;3) Hahaha. c:

Eff, I heard I remember before Going Crazy actually, but either way I was shocked at his skills! He's really good, not good enough to take on GD yet though.. XD His voice IS sexy, haha! C: