Lao Chen, who runs a hardware store, lives a warm and peaceful life. Until the new young policeman Li Yu came to the door, and a series of unsolved cases came to the door.
The criminal investigation skills he had hidden for many years finally came into use. In the fireworks of the market, two partners who are more than ten years apart work together to uncover the truth hidden in the shadows one by one.
Concept: In the fireworks of the city, little people partner with young police officers to pursue the truth and protect justice in ordinary daily life.