Peep Peep Demon King and Hero

If I could be reborn, I wanted to be born into a peaceful world without conflict. I wanted to enjoy life leisurely and at ease. Thinking such thoughts, I put a period to my painful life. I was born crying, surrounded by a kind family. Customers would visit from time to time, and each time my father would be injured, but my mother would comfort and heal him. Living such days, hundreds of years have already passed. I, who inherited my father's position, was called something one day. "Demon King" So it was. Huh?