In no particular order, i just added them as i remembered them :)
You will notice a pattern here btw, i am a bit of a fan of korean rock groups with female singers - especially female singers with a strange/unusual voice :)!
Nia - 니아 . (an awesome four girl rock band. !!!)
example (This is their most recent music video, but all their songs are pretty much amazing, especially 'Goodbye', check them out!!!)
Dear Cloud 디어 클라우드
Not my favourite dear cloud song, but i love how cute they all look in this one :)
(And most people would just recommend Ice Fortress because Kim Jaewook is inthe MV ¬_¬ i don't want people distracted by how pretty he is and ignoring the song!)