Lingxi is dormant in the human world as a medical woman, while collecting clues about star marrow under the name "Ye Luo". However, due to a bizarre "shadow murder case", she meets Mo Yuan, whose pseudonym is Xie Yunlan. The two went from testing each other to being forced to cooperate, and gradually discovered that the truth behind the case involved the annihilation of the Shadow Clan. As the clues of the star marrow surface, the conspiracy of the heaven, the ambition of the dragon clan, and the position of the monster clan are intertwined. Lingxi's shadow clan identity and Mo Yuan's dragon clan bloodline are exposed one after another. The former "enemies" are struggling on the edge of love and hate.
Their friends - the clever A Zhu, the transparent Si Ming, the smooth Feng Ci, the stubborn Mr. Xuan, the withdrawn Cang Yue, the complex Ao Xuan - each have their own secrets and purposes. In this dispute across the three realms, some stick to morality, some waver, and some die as martyrs. When the conspiracy of the mastermind behind the scenes (the Regent of the Celestial Realm, who designed to exterminate the Shadow Clan and imprison the Dragon Clan princess in order to seize power) is revealed, Lingxi and Mo Yuan must put aside their ethnic grievances and join forces to fight against powerful enemies. Their choices will determine the future of the Three Realms and the survival of the Shadow Clan.
