Chemistry student Lu Wei traveled to Xuanling Mainland via an experiment explosion, mistakenly becoming the ancestor of Tianyan Sect. He awakened the One-Shot Great Emperor System, but the system can only kill Great Emperors and does not enhance his own strength, so Lu Wei remains an ordinary person. Facing strong enemies, Lu Wei relied on chemical special effects and acting to disguise as a peerless master, and his name of invincibility spread across the mainland. Hun Tiandi, the number one of the current world, secretly colluded with the demon race, tested Lu Wei through the sect grand competition, and also sent him to crusade against the demon race. On the expedition road, he united the human and demon races to crusade against the Soul Hall, the crisis seemed to subside, but a wisp of residual demonic Qi quietly overflowed, and a new threat was already buried. This is an anti-trophy Xianxia story of a fake ancestor struggling to survive relying on acting and wisdom.