One night, a murder happened in Maoling Mountain Villa. The deceased was a rich man, Chen Shaoshan, who was shot twice and fatally injured. Inspector Wang took his son Jia Sheng to the scene to investigate and found a handkerchief with lip prints and a watch with female photos on the deceased. The suspected case is related to online celebrity singer Huang Manna. Inspector Wang found the ballroom where Manna worked, and when he found Jiasheng fooling around with Manna in the room, he flew into a rage. Detective Wang took Manna back to the police station for questioning, but he couldn't find any clues. Jiasheng's girlfriend Chen Wenying is the sole heir to Shaoshan. One day, when Jiasheng visited, a black man appeared and stole Wan Jia's key. Later, lawyer Yan announced his will, the mansion suddenly lost power, lawyer Yan was killed and his will was stolen. During the investigation, police officer Wang happened to meet Gao and arrested him immediately. Kao Kao confessed that the main messengers behind the scenes were ballroom managers Hu Dabang, Manna and Jiasheng. It turned out that Jiasheng owed Chen Shaoshan a huge debt after catching up with Ganlu, unable to repay it, and fell into a conspiracy of Dabang and Ganlu to kill with a knife. Jiasheng argued with Shaoshan, Shaoshan was shot and killed by Kao in the dark, and Jiasheng stole the IOUs. When Inspector Wang tried to arrest everyone, Jia Sheng was so emotional that he killed Dabang and Manna, and finally he could not escape the law.