Shen Mo was a genius forensic consultant whose work in life strayed into morally gray territory. After his death, his sins condemned him to the animal realm. Just as the underworld begins its modernization reforms, he uses his top-tier criminal investigation and autopsy skills to sign a “soul-selling contract” with the King of Hell, becoming a temporary worker in the Underworld's Cold Case Review Office. His task is to reopen the cases of souls trapped in Hell with unavenged grievances, earning merit to offset his past sins. Forced into the job, Shen Mo must now listen to the dead lament and investigate mysteries spanning both the living and the dead. Yet as he painstakingly clears the names of the wrongfully accused in case after old case, he discovers that his own death, the truth behind his younger sister's early demise, and even a vast shadow lurking deep within the underworld all seem to point toward him... This is a journey that begins with a reduced sentence and ends in redemption. A sinner will seek justice for all in the underworld, and an answer for himself.
