[Game website] In case you are wondering, Korean studio Webzen actually approved of this web version of MU Online to be developed by a China studio. Known as MU Classic, the global English server will be hosted by Game321, and Closed Beta is currently scheduled for early September.
From what I have seen, the original playable classes will be available, including the requirement of level 220 on a character before unlocking the Magic Gladiator class. As seen from the trailer above, other features such as Bloody Castle, Demonic Castle and Golden Castle.
