After the "Big Fall" event in 2993, a global nuclear winter enveloped the world, with 90% of the earth's surface covered by radioactive dust. The remaining humans hid in underground bunkers or in the "green spot" with low radiation levels. At the same time, the "Gray Tide Virus" induced by nuclear radiation is raging, and the infected people gradually mutate into irrational and highly aggressive "mutants", and some mutants have evolved special abilities. Resources are extremely scarce. Water, food, medicine, and clean energy have become the key to survival. The order of human civilization has collapsed, and the law of the jungle has become the norm.
