Xiao Fan, the Netherworld Demon Emperor, is trapped in the Immortal-Slaying Formation by the combined forces of seven female emperors and stands on the brink of death. The Empress of Yaochi activates the Haotian Mirror to revisit his past, and everyone finally learns that he was never a villain. As a child, Xiao Fan suffered the annihilation of his entire family, then was seized by a sect and forced to endure countless hardships as a test subject for medicinal experiments. He repeatedly bore terrible crimes on behalf of his seven female emperor disciples, enduring their misunderstandings. To protect the living beings of the Three Realms, he even willingly sacrificed himself to stabilize the lower realm and bring peace to the world. Throughout his life, Xiao Fan endured humiliation, performed good deeds, and protected his disciples with unwavering devotion. Upon learning the truth, the seven female emperors are overwhelmed with remorse, break down in tears, and kneel to beg for his forgiveness. In the end, Xiao Fan's soul merges with the Haotian Mirror, transforming into the Heavenly Dao of a new world and protecting all living beings for eternity.