According to Webzen, the players region is determined based on the IP that was logged when the account was created (and then subsequently logged in from).
And there seems to be no way to change that after the fact (so anyone that happened to be using a proxy or VPN back when they created their account, may not be in their preferred region).
There were several questions about this on the official MU Legend Discord channel and no one from Webzen responded to them (leading me to come to the conclusion that it cannot be changed). Thus the only way to workaround this is to just create a new Webzen account (which for most people, should not be much of an issue except not being able to use their preferred username).
Webzen does offer a method for permanently deleting an account BUT you cannot reuse that username and e-mail address to create another one anyway.
Unlike many other games where you can play on other regional servers with the same account (creating characters on that other region), this will not be the case for MU Legend. The client will only display the server(s) available for the region that you have been assigned to.
