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In 1997, Zhang Chengxi (played by Cheng Gia-ying), who had just become a prison officer, received a call for help from his sister. His stepfather had just attempted to rape her. Unable to suppress his anger after years of suppression, Chengxi rushed to confront his stepfather and got into a conflict with him. While defending himself against his stepfather's counterattack, he accidentally hit him unconscious with a wrench. Frightened, Chengxi fled the scene, only to be arrested by the police the next day for the murder of his stepfather. The key witness in court was his cousin Tang Lixian (played by Guo Jin'an), and Chengxi was found guilty and sentenced to 13 years in prison. In 2007, Chengxi was released from prison. Over the past ten years, he had been waiting to uncover the truth: why did Tang Lixian give false testimony? Today, Tang Lixian has become the boss of the witness agency and is seen by the public as a just figure who strictly pursues the truth and is unafraid of power. However, Chengxi's criminal record and volatile temper have made everyone who is close to him afraid. The road to expose Tang Lixian's true face is long and arduous, and the competition between the two men has officially begun.