After the Cataclysm, I Contracted the Subway

Seven minutes after the global blackout, subway maintenance worker Zhou Ye receives a map of a nonexistent line. Every time he lights up an abandoned station on the map, he gains new survival resources: ventilation shafts become air farms, repair depots become mechanical workshops, and sealed tunnels lead directly to disaster zones. The surface is overrun by mutated creatures, and survivors fight for the last shelters, but Zhou Ye decides to restart the entire underground railway. When the first train passes through the darkness, he finds that waiting for him at the terminal station is his own self, who disappeared before the disaster struck.