In the wasteland world after the nuclear war, former special soldier Li Hao was reborn and returned to three days before the outbreak of the apocalypse. Relying on future memories and the suddenly awakened "Doomsday System", he stockpiled supplies and recruited partners in advance, vowing to reverse the fate of human extinction. Faced with mutated monsters, the remaining darkness of human nature, and the cruel competition for resources, Li Hao used the enhanced abilities and strategic wisdom given by the system to lead survivors to build shelters to fight against natural and man-made disasters. In despair, he gradually unlocks the system's ultimate mission, reveals the truth behind the apocalypse, and becomes mankind's last hope.