The apocalypse is coming, and the reborn Shen Yan awakens the [Refuge City System], starting from a zero-level ruins, establishing a city-state and forming an army. The virus is raging and mutants are rampant. He cleans up the stronghold with iron-blooded tactics and recruits the first batch of survivors-Zhou Lin, the seed of the female legion with excellent marksmanship, Xu Jianguo, the logistics master, and Lin Wan, the girl with S-level mental potential... From surviving alone, to training the legion, sweeping the wasteland and annexing enemy camps. Recruiting people, training troops, cleaning out the evildoers, upgrading the panel, every step is a direct hit! The traitor Wang Sen from his previous life appears, a wave of mutations is coming, and external forces are eyeing him - under Shen Yan's banner, who can be king?