Didn't know of the group, Infinite before, but decided to search them up on Youtube. Gotta say I freaking love song and dance choreography. Their moves are so slick and they looked really neat on stage! The song's really catchy as well. Great performance.
INFINITE - Come Back Again (uploaded by CrazyCarrot250)
[HD] 100612 MBC Music Core Infinite - Come Back Again (uploaded by dianakimify)
I think they probably just need to brush up their vocals abit and they'll be good.