Smile Killer

A series of murders occurred in Ping City. The corners of the deceased's mouth were brutally cut open, forming a strange smile. Shen Nian'an, a professor of criminal psychology, was invited to assist in the investigation, but found that she was led to the massacre of her family fifteen years ago - she was the only survivor. As the investigation deepened, a secret organization called "Morning Base" surfaced, and her brother Shen Nianchen was actually one of the brainwashed and trained killers. Between chasing the murderer and redemption, Shen Nian'an must face the fate of being manipulated and uncover the deepest light and darkness of human nature.