After being imprisoned, forensic assistant Shen Zhiyao, who was falsely accused of murder, actually solved a series of murders by dissecting unknown corpses in prison. The silent prison guard Zhou Lin secretly assists, but he is burdened with old cases; the foolish grandmother uses the corpse cloth as a secret message, the deaf-mute boy uses a picture book as a certificate, and the rich girl is wavering between self-preservation and redemption. When the third corpse started to 'speak' in the morgue, Shen Zhiyao realized that he was never the scapegoat - he was the only one chosen by them who dared to listen to the corpse.
