After the "Great Annihilation", civilization fell into ruins, and survivors struggled to survive in the radiation dust known as the "Gray Domain." Ling Xiao, a scavenger who makes a living by picking up electronic waste from the old era, accidentally discovers a mysterious code in an abandoned military terminal. This code not only gave him weak authority to control "mechanical slaves" (robots from the old era), but also pointed to a legendary pure land - "Sky Ark". However, the activation of the code also attracted coveters: the "Purification Order" who regarded technology as a heresy, and the warlords who controlled the "Iron Barrier", the largest survivor stronghold. In order to protect his sister Ling Yue's only hope, Ling Xiao was forced to embark on a dangerous road. He must continue to decipher codes in the cracks of the wasteland, strengthen his strength, and at the same time uncover the shocking secrets hidden behind the "Great Nirvana" and the "Sky Ark".
