During the Qin and Han Dynasties, Wei Wang, a military commander, led his troops into a fierce battle with sand bandits in the Western Regions. There he saved an incredibly beautiful woman named Xiaowei and brought her back to the Jiangdu王府. However, unknown to him, this Xiaowei was actually a "Nine Skies Beauty Fox" disguised in human skin. To maintain her disguise, her skin must be nourished with human hearts. Therefore, Xiaowei's 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 terror. Meanwhile, Xiaowei also developed feelings for Wei Wang due to his bravery and handsome appearance. Using her demonic powers, she attempted to seduce Wei Wang and replace his wife, Peirong. Peirong discovered Xiaowei's infatuation with her husband and realized that she was not an ordinary person. She secretly sought help from Pang Yong, a highly skilled wandering swordsman, and Xia Bing, a pure-hearted demon-slayer. Together, they worked to save Wei Wang... Thus began a complex tale of intertwined emotions, temptation, betrayal, resistance, and life-and-death battles between humans and demons.