An unknown virus swept the world and modern society collapsed in a matter of months. Technology and order were ruined overnight. The city has become a dangerous place where monsters roam, and the survivors are forced to embark on a long road to survival. Han Xiaoxiao, Sun Shuang, Li Zhuang, Zhou Hui and the mechanical dog Xiaoer formed a temporary team, fighting monsters and upgrading, looking for survival resources, and dealing with personality conflicts, mysterious events and daily nonsense. The team continues to grow during the adventure, not only discovering the truth about the doomsday virus, but also confronting the mysterious organization trying to control the fate of mankind. In the end, they used humor and strength to reveal the light of humanity behind the doomsday.