The doomsday suddenly arrives, and 27-year-old Ling Yu dies a miserable death trying to save someone, but unexpectedly is reborn as an intelligent nuclear power plant on the verge of meltdown, obtaining the civilization transition system. Facing 327 infected individuals, a runaway reactor, and the approaching disaster, he can only control access control, robotic arms, and sweeping robots, teaming up with college student Shen Yan who broke into the power plant to survive. From repairing the cooling system and wiping out hordes of corpses, to sheltering survivors and rebuilding order, Ling Yu gradually transforms the nuclear power plant into a doomsday fortress. However, when mutated creatures and hundred-meter behemoths appear, this last hope of humanity will also welcome the ultimate doomsday trial.