In the apocalypse shrouded in "gray fog", the technology and life of the old world have been distorted into horrific "aberrations", and humans are huddled in the last fortress city. Lu Yuanxing, a former resonance engineer and now a scavenger, accidentally obtained a mysterious data core during an operation. This core emits "echoes" from the old world, making him the target of the city's rulers, the "Iron Fist Society" and various hidden forces. Holding a secret that can change the fate of mankind, Lu Yuanxing struggled to survive in the wasteland of mechanical monsters and deceitful human hearts, walking step by step towards the forgotten "abyss", trying to uncover the final truth about the coming apocalypse.
