The exiled immortal Qin Wuhen sneaks into the mortal realm carrying the Heavens Dark System to rebuild the declining Wushuang Demon Sect, intending only to slack off and fish in troubled waters. But the system forces him to recruit monstrous disciples possessing indestructible fairy bones and nurture them toward the demonic path. He takes in the ice-mountain demoness Ji Wushuang and the bone-excavated supreme youth Lin Dong. To fool the heavenly inspection, he deliberately imparts ambiguous, heterodox cultivation techniques. Who would have thought the disciples possess extremely high comprehension and make up things on their own, cultivating the evil techniques into the Supreme Chaos Divine Light Technique, while also slaying batches of hypocritical righteous paths, successively proving Dao as Great Emperors, and holding boundless admiration for Qin Wuhen.