I love VIXX. <3 The dark concepts are really fun. I always at least love one thing from all the Kpop artists.I can't believe I forgot VIXX and Roh Jihoon....
Girl's Generation was my number one...Well, at least until Jessica got kicked out of the group, which took at least 30% of my Kpop Heart.
After School was my first band, then later I got into Kara. Groups that I got into when they debuted are Red Velvet, Hello Venus and Lovelyz
Then I'm also a big fan of Taeyang.
I definitely recommend you give it a chance there are so many different artists to choose from. :) A classic that most people hear first is "Ring Ding Dong" by ShineeOooh, never heard too much K-Pop but when I do it always sounds really nice to me ^ ^, never found out who the artists were, but maybe I should look into it pretty soon.