Since the end of the 20th century, the Warsaw Alliance, represented by country S, and the Northern Alliance, headed by country M, have maintained a three-hundred-year-old confrontation. The strength of the two sides has waxed and waned. Local hot wars have broken out one after another. It is difficult for the people to gain real stability. Biochemical weapons created for the war have been accidentally leaked, and the earth's ecology has been severely damaged. In order to survive, human beings can only build safety cabins and live together. The entire human society is in shock. Natural conditions continue to deteriorate, and where will humans go from here?
Intention: Different choices human beings make when facing difficulties