Lin Shuying (28): A criminal profiler with the criminal investigation division, gifted with hyperthymesia and the ability to read microexpressions. She suffers from post-traumatic stress disorder after an undercover operation went wrong three years ago.
Jiang Jianqiu (26): A forensic trace analysis engineer from a family of hackers, skilled in data recovery and crime-scene reconstruction. She joins the police force to uncover the truth behind her younger sister’s disappearance.
Central case: The “Mirror Killer” serial murders, which run throughout the entire story.
