After encountering countless pollution and destruction, the planet where people live has become dilapidated and they can no longer remember the name of the place where they are. However, the order of the land has not been broken down. There are still residents outside the high wall that protects against the wind and sand. They are called "corners" by the people inside the high wall. ', The 17-year-old Changgongan is one of them. When they were young, their elders taught them that the outside world has become desolate. There are no other places to live except the four major Changzhous. They cannot go outside. Aren't we already outside the high wall?
