During the Qin and Han dynasties, Captain Wang of the Wang family army saved a beautiful woman named Xiaowei during a fierce battle with sand bandits in the Western Regions, and brought her back to the Jiangdu Wang residence. However, this Xiaowei was actually the "Nine Skies Beauty Fox" disguised in human skin. To maintain her human form, Xiaowei needed human hearts for nourishment. Therefore, her invisible assistant Xiaoyi — a demon transformed from a desert lizard — killed people every few days to offer Xiaowei their hearts as a sign of his love for her. As a result, the city of Jiangdu fell into a state of terror. Xiaowei also developed feelings for the brave and handsome Wang, using her sorcery to seduce him and attempting to replace Wang's wife, Peirong. When Peirong discovered Xiaowei's infatuation with her husband and realized that she was no ordinary person, she secretly sought help from Pang Yong, a highly skilled wandering swordsman, and Xia Bing, a pure-hearted demon slayer, to rescue Wang... Thus began a complex tale of emotions, temptation, betrayal, resistance, and life-and-death battles between humans and demons.