Ragnarok Online: Prequel is currently under development by Chinese studio Dream².
Ragnarok Online, the fantasy RPG from South Korean developer Gravity is getting a prequel. Developed by Chinese developer Dream², the prequel is licensed by Gravity, so don't worry about yet another Chinese rip-off game like the League of Legends ripoff, 300 Heroes.
From the debut trailer, Ragnarok Online: Prequel looks like it will carry over many of the main features from the original game, including dungeons and monster cards. Not much else is available on the game yet, but check out the Chinese-language trailer below.