Lu Qing experienced a doomsday, with corpses strewn everywhere and the smell of blood everywhere. Man-eating monsters and people roam the apocalypse, superpowers are noble, and ordinary people are low. Because of him, his parents and best friends all died in this era of cannibalism, but he, a good-for-nothing person, managed to survive in this world. When he woke up, a thing claiming to be the system took him back to the future and asked him to save the apocalypse.