In order to seek a shortcut in cultivation, Mu Yang betrayed and killed his best friend Yin Yuan. After Yin Yuan was reborn, he was determined to take revenge. During the process of revenge, Yin Yuan discovered that Mu Yang possessed the soul of the demon king Chi Mo. Chi Mo was also reborn with the memories of his previous life, and had a deep grudge against Mu Yang and the Lingtian Sect. The two went from hostility to cooperation, working together to expose and fight against the Lingtian Sect's conspiracy.
