During the Qin and Han Dynasties, Commander 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. Unbeknownst to them, this Xiaowei was actually the "Nine Skies Beauty Fox" disguised in human skin. To maintain her human form, Xiaowei required human hearts for nourishment. Therefore, her invisible assistant Xiaoyi — a demon transformed from a desert lizard — killed people every few days to offer their hearts to Xiaowei as a sign of his love for her. Consequently, the city of Jiangdu fell into a state of terror. Xiaowei also developed feelings for the brave and handsome Wang Sheng and used her demonic powers to seduce him, hoping to replace his wife Peirong. When Peirong discovered that Xiaowei was infatuated with her husband and realized she was no ordinary person, she secretly sought help from Pang Yong, a skilled wandering swordsman, and Xia Bing, a pure-hearted demon slayer, to rescue Wang Sheng... Thus began a complex tale of intertwined emotions, temptation, betrayal, resistance, and life-and-death battles between humans and demons.