Fox demon Yu Mian is injured and accidentally enters the human realm, coincidentally becoming partners with the mortal Shen Huaijin, and mutual affection grows between them through day-to-day companionship. However, Yu Mian is unfortunately implanted with a soul-devouring Gu by hidden enemies behind the scenes, forcing her into the desperate predicament of assassinating her beloved. The two embark on a journey together, making a group of partners along the way, while searching for a way to break the Gu poison and resisting crises from all sides. Having been through thick and thin, they stand by each other through hardships, struggling to break free from the shackles of fate and rushing toward their own future.