Enter SimpleMMO World (LN)

SimpleMMO - A simple game where there's no maximum level. Which mean, you can level up as much as you can and the current highest level player is Level 83624. During the event, after players defeating Balthazar, the World Boss, some of the players received special rewards that invite them to the other world with their level and items intact. Their adventure in other world begin.

PS: SimpleMMO is a real game and you can find it Play Store apps.