Trainee police officer Chen Xiao was framed as a serial killer, but the surveillance footage exposed unexplainable gaps in the playback. Su Tang, a cold-faced consultant, saw the clues and secretly helped him track down the truth. The secret data of forensic doctor Zhou Yan and the video of deaf-mute witness Lin Xiaoyu actually pointed to the shocking cover-up by the top brass of the police force. When the scapegoat tears open the abscesses of the system, the real hunters slowly take off their gloves - and they have been dormant under the police badge for ten years. Chen Xiao insisted on calling for surveillance and accidentally triggered hidden clues, which became the only breakthrough to reveal the truth. Su Tang is cynical on the surface, but in fact she is secretly investigating old cases. She sees that Chen Xiao is not the murderer, and secretly assists him in collecting evidence, but conceals her relationship with the deceased as an underground informant.
