When serial murders reappear in the manner of the "Sculptor" twenty years ago, two souls trapped in the past are forced to become partners. Shen Yan, a genius forensic doctor who lacks emotion, only believes in the "rule" of evidence; Jiang Hui, a criminal psychology professor who lives in the shadow of his mentor, the serial killer, is well versed in the "shadow" of human nature. One of them is searching for the truth on the autopsy table, and the other is portraying the devil in the criminal mind. However, it seems that the murderer's goal is not just imitation, but a carefully designed "graduation work" for the two of them. In the process of hunting down the real murderer, they must first face each other's bloody and traumatic past - she is the orphan of the victim, he is the successor chosen by the devil. When the shadows shrouded them, they discovered that the other person was the only light they could see in their chaotic world. This is a story about retrieving each other from the deepest depths of sin and ultimately becoming each other's redemption.
