Super Junior 30 Day Challenge: Day 16: The Very First SuJu Song That You've Ever Heard

This song is gonna get on your nerves :D
But I've mentioned this earlier what the first song was >;3

♥A-cha♥

I think I've heard It's You before... But I'm not really sure.
Not to mention I didn't know who they were when I first heard it.
Anyway, A-cha is my first... o.O :D