One thing I know for sure about Korean artists: The dances for their songs are way harder to learn than your average Japanese boyband's. For example, it took me something like two go-throughs to learn Ho Summer. I'm... still working on Tell Me. (And that's one people learn for random social gatherings, like Hare Hare Yukai or something! *so hopeless*)

Also, Girls Generation/SNSD. GEE GEE GEE GEE BABY BABY BABY~ *loves that song SO MUCH*