Detective Jiang Yan has been undercover for three years and infiltrated the black market, but is wanted by the entire team as a serial killer. When the evidence pointed to him, only his former partner Lu Xiao vaguely noticed something was wrong. Forensic doctor Chen Wu secretly tampered with the report, anchor Ruan Zhao used crazy words to piece together the truth, and in the hands of Lao Huai of the scrap station, there was a police badge code that was covered up thirty years ago. Jiang Yan must use his own reputation to detonate a series of murders spanning three generations before he is surrounded and suppressed.
