When machines replace flesh and blood, and when interests overwhelm conscience, the most precious thing for people is their unalienated original heart. When the lights of the floating city drown out the dim light of the Rust Belt, there are always people who are willing to go to the Spark with their flesh and blood. In the acid rain, this spark is Wei Liang's obsession, the truth hidden in the fragments of the prosthetic body, and the resistance that is about to be ignited. Even if you are in the wasteland, even if your flesh and blood are mixed with machines, if you keep the light in your heart, you will not be reduced to a machine.