Remember dont create a character on the android stuck on nickname. Do it on rooted bluestack region changer app korea. Haven't test on rooted tablet or phones with no sim card with region changer.

I got this game too work on my android with simcard. Bypass the nickname and create a character/class, make sure it's linked to facebook

All you have to do is get a computer get a rooted bluestack having region changer to korea make sure you created character and name boom you're in the game remember your server that your character in after that install your android with facebook linked where the character is created with server instead making new character with the nickname you can play after that no created needed. 

Do the same step if you want another character/class.