On the Mid-Autumn Festival, a man's body was discovered at a construction site. He was barefoot and named Yang Li, a Chinese teacher at a public elementary school. Detective Zhao Yong tracked down his wife, Xue Hua, but she seemed indifferent to her husband's death. Instead, she was only concerned about the whereabouts of their adopted daughter, Qianqian, who had gone missing on the night of the festival. After painstakingly piecing together the clues, the police caught the body transporter, a truck driver. However, the day after the driver confessed, a mysterious call appeared online. It was Qianqian, claiming the police had arrested the wrong person and that she was the killer. The reason she gave for the murder was shocking: her adoptive father, Yang Li, had sexually assaulted her. After opening a case, the police found bloodstains and a murder weapon in a villa, and Qianqian's fingerprints were indeed on them. It seemed an open-and-shut case of intentional murder, but Xue Hua believed her daughter was taking the blame for her boyfriend, A Lan, and pointed out that A Lan could have avoided the surveillance cameras. Was that really what happened? Online, public opinion about Qianqian was in an uproar. As the investigation deepened, the police discovered that Xue Hua also seemed to have a powerful motive for the crime...