Before 1997, the nuclear war completely wiped out the surface of the earth and destroyed all civilizations. Only the 400 residents who worked and lived on the 12 International Space Stations survived. Three successive generations were born in space, and the number of survivors has reached 4,000. In order to ensure the safety of all survivors, 12 space stations are connected as one and have undergone adaptive transformation-this huge space station is called "Ark".
After so many years, the resources on the "Ark" have been exhausted, and the leaders had to adopt extremely harsh measures to maintain order: the death penalty was restored and the birth of the population was strictly controlled. In order to survive, the leaders decided to implement a ruthless but necessary top-secret plan-to exile 100 juvenile prisoners with criminal records to live on the surface of the earth to investigate whether the earth has returned to a livable state.
