There is a new game called WonderKing and it's in closed beta.
You can still play the game, just register. Then you should get 2 e-mails. One with the activation link for the account. And another that gives you a closed beta key.

WonderKing - Play for FREE NOW!

It kinda looks like a rip off of MapleStory, however it looks promising.
Some people have said that it is going to be better than Maplestory.
The classes have more skills, I will say that.
Anyways, I have been trying it for one day so far, and it's pretty decent.