Apocalyptic Underground City System

Countries around the world were infected with the X virus. Sun Yunsheng accidentally obtained the underground city system. In order to save the world and defeat the zombies, he continued to complete the tasks issued by the system, continuously expanded the scale of the underground city, continuously strengthened himself, saved mankind, and had a difficult confrontation with the zombies... This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.