In AD 2149, after the "Great Rust" disaster, the technology of the old world was reduced to scrap metal, and humans retreated to the "Iron Dome City". A mysterious energy crystal called the "Source Core" is discovered, which can drive the mechanical remains of the old era, giving birth to a new order led by the "Rack Master". Lin Ye, an 18-year-old boy, will start as a scavenger, control a giant steel body, and uncover the ultimate secrets of the source core and human civilization.
