During the Qin and Han Dynasties, Wei Wang, a military officer, led his army into a fierce battle with sand bandits in the Western Regions. During this fight, he rescued a stunningly beautiful woman named Xiaowei and brought her back to the Jiangdu王府 (mansion). However, unknown to him, Xiaowei was actually the "Nine Skies Beauty Fox" wearing a human skin.
Her human skin required maintenance through the use of human hearts, so Xiaoyi, Xiaowei's invisible assistant—a desert lizard turned demon—would kill people every few days to extract their hearts as offerings to Xiaowei, as an expression of his love for her. Because of this, the city of Jiangdu fell into a state of terror.
Xiaowei also developed feelings of love for Wei Wang due to his bravery and handsome appearance. She used her magical powers to seduce Wang, hoping to replace Peirong, Wang's wife. When Peirong discovered that Xiaowei was infatuated with her husband and realized she was not an ordinary person, she secretly sought help from Pang Yong, a wandering swordsman with great martial arts skills, and Xia Bing, a pure-hearted demon slayer, to rescue Wang...
Thus began a complex tale of intertwined emotions, temptation, betrayal, resistance, and life-and-death battles between humans and demons.