In the Evernight City ruled by steam and gears, ordinary guard Zheng Mian's biggest wish every day is to lie down and sleep. He always looks sleepy, and looks like a loser to anyone. However, when a bizarre serial disappearance broke the peace in the city, and everyone suspected that the legendary mechanical demon was responsible, Zheng Mian "happened to fall asleep" at the crime scene time and time again, and the few words she casually uttered after waking up could always accurately reveal the truth of the case.
No one knows that he has the ability to "dream regression" - every time he falls asleep, his consciousness can enter the causal line of events and see details that ordinary people ignore. In order to maintain his carefree fishing life, Zheng Mian was forced to get involved in one mystery after another. The seemingly confused villains always thought that they had done everything perfectly, but they didn't know that Zheng Mian had already seen through everything in his dream. From the Gear Street at the bottom to the ruler's dome palace, a shocking conspiracy spanning the five floors of Steam City is emerging, and Zheng Mian's dream is about to touch the truth of this world... And the greater unknown.
