My Wife Wants to Become a Fairy

Bai Ling was originally a nine-tailed fox, an ancient mythical beast. However, after a battle between immortals and demons, Bai Ling sealed his memory and abilities. As a result, Bai Ling only had one tail. He was shaped like a twelve- or thirteen-year-old girl. His cultivation was low and he had a headache whenever he used his brain. Originally, he was living a carefree life, with people and monsters on equal terms, but he didn't expect to suffer a disaster, and all his friends around him died. Where should she go? Who is this young man who protects her everywhere? Can she break the seal and regain her memory?