OOooh, such a hard question! KARA, Big Bang, Super Junior, Mamamoo, BTS, SS501/SS301 and sooooooo many more 
RpNation
animeloulou
EmmaStarlight
got me beat. i know fx snsd shinee one big bang song and one nu*east song
animeloulou
Meant to say SNSD, f(x) and SHINee too Don't worry, you're still a K-Pop fan whether you know 1 song or 500 songs 
Don't worry, you're still a K-Pop fan whether you know 1 song or 500 songs