The story begins with a sudden and unprecedented global cyber attack called "Zero-Day Catastrophe", which paralyzed most of the AI systems that dominate the war, causing war machines that rely on high technology to instantly fall into chaos. In this catastrophe, an unknown digital virus "Final Echo" that can evolve and materialize itself begins to spread. It can not only infect the system, but also distort reality, turning data disasters into horrific phenomena in the physical world.
The male protagonist Zhang Yuehao, an engineer who was once a top weapons designer but now lives in seclusion, and the heroine Wang Xiaona, a top agent/information security expert who belongs to a consortium and is responsible for tracking and eliminating high-tech threats, are tied together by fate because of this disaster. They must work together to travel through ruined high-tech cities and out-of-control automated war zones. While avoiding pursuit by all forces, they must uncover the terrifying truth behind the "Zero-Day Catastrophe" and the "Final Echo". Their journey is not only about personal survival, but also about preventing this out-of-control technological power from leading human civilization to ultimate annihilation. This is the ultimate battle between human intelligence and its own creation.
