Female lawyer Liu Zhiyan (played by Jin Yunzhen) has outstanding business ability and has maintained a record of never losing a case. She lives with her daughter Eun-young and pours all her love on the latter. At the sports meeting held by the school, Eun-young was kidnapped in the chaotic flow of people. 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 was not for money, but asked Liu Zhiyan to defend a murder suspect. A month ago, a young woman was killed at home and abandoned. Zheng Tiezhen became the biggest suspect because he left fingerprints and footprints at the scene. In the first instance, Zheng Tiezhen was sentenced to death. Now there are only four days before the second trial. Liu Zhiyan found Officer Jin, an elementary school classmate who was deeply involved in the disciplinary case, to help and quickly launched an investigation into the case. As various evidence emerged, Liu Zhiyan found that there was indeed something strange about the case, and the hidden truth behind the case only revealed the tip of the iceberg...