Liu Xi, who has always dreamed of being a police officer, was transferred to the Serious Crime Unit as she wished. Unexpectedly, her boss asked her to monitor Jiang Chenggang, a detective who had cooperated with the police for many years. Jiang Chenggang was lazy and had a ruffian appearance. He often "bullied" Liu Xi. Liu Xi was not to be outdone, which led to a series of ridiculous things. The cooperation between the two became more and more tacit and they solved many cases. And is there really a problem with Jiang Chenggang? What did Liu Xi discover again?