Liu Zhiyan (Jin Yunzhen), a female lawyer, has a strong professional ability and keeps a record of never losing a case. She lives with her daughter Eun-young and devotes all her love to the latter. Eun-young was kidnapped in the chaotic crowd at the school sports meeting. At first, Liu Zhiyan was warned by the kidnappers for calling the police. The next day, Liu Zhiyan finally learned the purpose of the kidnappers: he asked Liu Zhiyan to defend a murder suspect, not for money. A month ago, a young woman was killed and abandoned at home. Zheng Tie Town became the biggest suspect because she left fingerprints and footprints at the scene. In the first instance, Zheng Tie Town was sentenced to death. There are only four days before the second trial. Liu Zhiyan found a police officer Jin, a primary school classmate with a deep violation of discipline, to help and quickly investigate the case. With the emergence of various evidences, Liu Zhiyan found that the case was really suspicious. In fact, the mother of the murdered woman wanted Qiu Tiezhen to die even more tragically because she found her daughter's death was too tragic, so she bribed police officer Lin to be a murderous pervert and then killed him herself. Among them, Jiang Zhiyuan was involved, and his father thought it was his son's crime, so he wanted to help his son get rid of the crime and erase the stain himself, so the plot was solved. In order to answer, I watched the film again and typed the name. It is not easy.