1. Apocalyptic background: A global "red mist catastrophe" suddenly occurs. The virus spreads along with the red mist. Half of the human race mutates into bloodthirsty "corrupt mutants". The remaining humans rely on resource points to establish survivor bases. After the collapse of order, a chaotic pattern of "base autonomy + weak alliance" is formed. Resources (food, medicine, energy) and power become the core of survival.
