A year ago, Yan Chi Xia killed the fox demon together with her family. Unexpectedly, the younger sister Jiang Xue was turned into a demon due to demon poison, and under the intervention of the sect, she was even more involved with Yan. The deep misunderstanding caused by Chi Xia caused that he has become her mortal enemy. The two are separated by two generations of enmity against the monsters. Yan Chi Xia becomes one who exterminates demons and demons everywhere, while Jiang Xue quietly transforms into a nine-tailed fox Shen Si Rou.