Time background: In 2125, thirty years after the Third World War, the earth entered the era of "cyber nuclear winter". Nuclear pollution and nanomachine storms form a permanent night sky, and the surface temperature hovers at minus 20 degrees all year round.
Geographical pattern: Survivors gather in the vertical city "Tower of Babel", with a total of 108 floors. The upper level is a neon city controlled by chaebols, the middle level is an industrial area under the jurisdiction of the Mechanicum, and the bottom level is a lawless place where radiation swamps and mutated creatures coexist.
Core technology: 78% of the human body's organs can be mechanized, but regular injections of "neural lubricant" are needed to prevent cyberpsychosis. Memory chips can store personality backups, but are strictly controlled by major forces.
