Lao Ye (Li Xuejian), an investigator with the provincial public security department, is ordered to go undercover at Shengtang Company as head of security and secretly investigate the "11.12 Deputy Mayor Murder Case." Unexpectedly, Deputy Mayor Zhu Lei (Niu Baojun) commits suicide in detention, and his earlier confession also disappears. Detective Shao Changshui (Wang Zhifei), unaware of the true situation, turns a suspicious eye on the undercover Lao Ye. Shengtang president Rao Shangdu (Li Qiang) is very concerned about the whereabouts of the confession and spares no expense in bribing judicial police in an attempt to obtain the materials. Because only the senior leaders of the provincial department know about Lao Ye's operation, Shao Changshui encounters all kinds of friction while working with him. Just as the case begins to show leads, Changshui receives a transfer order and believes that Lao Ye is behind it. Bound by discipline, Lao Ye remains noncommittal. Two months later, Changshui returns to Shengtang. An unexpected phone call summons Lao Ye away, and twenty minutes later, Lao Ye dies in a car accident. Before dying, he writes "murder" in Changshui's palm...
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