In 2431, the total number of people in the world has risen to more than 15 billion. The environment became hostile. In order to escape reality, humans have built technological metropolises. The rapid development of science and technology has blinded people's eyes and concealed this dirty world. Outside the city, garbage is everywhere, corpses are strewn around, and there are even some poor and low-class people living there. In a dark corner, among the mixture of garbage and corpses, a virus is quietly breeding...