After being framed, former forensic pathologist Su Zhao went into hiding under a new identity. But a bizarre "mirror-image murder" pulls her back into the whirlpool of cold cases, when private detective Gu Yanqiu seeks her out. As the chain of evidence is repeatedly tampered with and witnesses vanish under mysterious circumstances, they must join forces to crack a serial killer's psychological code. Prosecutor Lin Jiyun's silence, black-market appraiser Zhou He’s greed, blogger Bai Tang's obsession with revenge, and psychiatrist Cheng Jin's cryptic letters all point to the same thing: this murder is meant to restart a trial from ten years ago.
