Replying...
Intro. in the past, you were the feared demon king, a man who threatened the peace of the other races in the world, one day, all the races gathered their armies, heroes and adventurers and made a surprise attack on you, you, you were tired of living like this, and you let one of the heroes end your life, you thought you were free, but your soul spun around and God did not give you eternal peace, otherwise, as punishment for having killed so many people in your previous position, made you reincarnate in the middle of a forest, you are a gray wolf capable of leveling up, you are free to choose your appearance, but be careful, there are many adventurers in the area, have fun!

Reincarnation

@Perx