In just a few days, three celebrities who have no connection with each other died unexpectedly with a smile on their faces, including a movie star, a dancer, and a diving champion, causing quite a stir in society. At the same time, Wang Buer (Zhang Wen), a passionate young policeman who is good at making jokes, and Huang Feihong (Jet Li), a veteran in the police force, teamed up to solve the case, causing a lot of trouble, which made their boss Angela (Michelle Chen) very depressed. One day, Wang Feng (Tong Dawei), a real estate project manager, died with a smile, and the case was handed over to Angela's team. In order to reverse the unfavorable situation in the police station as soon as possible, Angela, Wang Buer and Huang Feihong launched a full-scale investigation. They first started with Liu Jinshui (Liu Shishi), an actress who had had relationships with several of the deceased. In the process, the charming and ghostly Dai Yiyi (Liu Yan) appeared, which undoubtedly made the case develop in a more complicated and confusing direction. What is the final truth, can Wang Buer make a miraculous achievement?