I don't know if you've heard of it but it's a great MMORPG you can play.
Premise: You're living in the times of Ragnarök, the end of the world in norse mythology, and monsters have invaded the world. You have your character and you can kill the monsters and customise your character and his/her weapons to gain levels and do the usual RPG-levelling-up-thing. There are bosses you can go up against, quests to get special items, and an in-game economy and social network so you can chat as well as level.
It was made in korea, and the graphics are light and somewhat animé-ish.
You can install it with the help of this guide
and try it out