Lin Jiuwei, a nine-tailed fox demon who has lived for a thousand years, hides in the world and opens an antique shop to live a low-key life, but his identity is accidentally discovered by Su Xiaoyi, a graduate student in anthropology. Su Xiaoman holds a modified detector and studies fox demons persistently, taking Lin Jiuwei as the core research object of his thesis. The demon-hunting family is closing in every step of the way, and the secret of Qingqiu's legacy is gradually revealed. In order to protect Su Xiaoman, Lin Jiuwei even takes out half of the demon pill to share her life, transforming from an old demon who shuns the world into a companion willing to protect her. Su Xiaoman has also grown from a simple researcher to a half-demon who can stand alone. The two work together to fight against the demon-hunting forces. Amidst the fireworks and thousands of years of bondage in the world, they compose a healing story in which demons and humans redeem each other and protect each other.
