It tells the story of Jiang Li, an outer-door disciple of the Tianxuan Holy Land, and his survival crisis and growth journey as an undercover agent for the Demonic Sect. On the surface, Jiang Li is a disciple of the Tianxuan Holy Land; in reality, he is the 666th body possessed by the Demon Lord of Ten Thousand Desires. He obtains a cultivation technique with independent consciousness after activating the "Cultivation Technique Growth Program." Cultivation techniques such as The Profound Yellow Heart-Tempering Manual, The Dragon-Slaying Sword Technique, and The Imperial Ultimate World-Shocking Skill often act on their own. For example, The Supreme Divine Thunder Induction Heart Sutra automatically triggers the "Heaven’s Punishment"—striking sinners with thunder; The Profound Yellow Heart-Tempering Manual forces brainwashing to educate and reform others. Jiang Li navigates between his undercover mission and the forced "righteous acts" of his cultivation techniques. He goes through events such as the Trial of the Heart-Questioning Forest, the Foundation Establishment through Dao Comprehension, and the slaying of an avatar at the Spirit Transformation Stage. Eventually, he is promoted to a candidate for the Holy Son and plans to destroy the Demonic Sect.