The moment Jiang Yan, the criminal police captain, knelt down and admitted his mistake, the whole city was in an uproar - the murderer turned out to be the deaf-mute boy Lin Ya who he had saved five years ago. Each murder case accurately corresponds to the neglected violent trauma, and forensic doctor Chen Sui discovered that these "corrective" killings perfectly overlapped with her undisclosed research. When teacher Su Tang's silence becomes accomplice, and the recording of former black marketeer Lao Dao reveals the bloody origin, Jiang Yan must personally tear apart everything he once believed in between justice and redemption.
