Looking for the best 2D side-scrolling action-based RPG that is 'windowable', not full-screen.

Definitely not looking for MapleStory or another one like it.

Please suggest me some, and refer me to a reg-guide link if it is in foreign language. Thx!

I suggest you to try out "Wonderking" here (http://www.onrpg.com/boards/43023.html?highlight=Wonderking+register) you can find the registration guide for the korean version.

Also Ghost Online is nice, it's in English.
go.gameflier.com.my