A mysterious being known as the “Fire Thief,” carrying with it the laws of the apocalypse, suddenly descends upon the planet Tianshui. Only those who can pass all forty-nine Doomsday Rules will uncover the truth behind everything. [Doomsday Rule No. 1: Sleep Deprivation] Content: From the moment the rule is announced, no one may fall asleep in any form for 72 hours. Failure Punishment: Anyone who falls asleep during this time will never wake up again. As society collapses and the world falls into chaos, humanity trembles under the terror of the Doomsday Rules. Amidst this despair, a transmigrator named Guan Tong discovers that he can actually see the “Hidden Rules” behind the Doomsday Rules.