When the steel maze fell from the sky and the entire city became a survival playground, designer Lu Yin accidentally awakened the "devourer" talent-touching monsters can plunder their characteristics, but at the cost of gradual genetic alienation. Faced with military hunting, digital vision and the shadow of the mysterious "Screener", he must cooperate with the bioengineering genius Lin Yuqing and the "Zebra" team of free hunters to crack the rules of the maze in a seven-day countdown to death. However, as his devouring ability upgraded, Lu Yin discovered that the most dangerous monster might be lurking in his increasingly metalized body...