Chen Mo was forcibly admitted for mental illness. In order to prove his innocence, he drew a criminal route map of the murderer of an unsolved murder case on the spot. Criminal police captain Shen Yao found key clues from the picture, and the two teamed up to investigate. However, there are undercurrents surging inside the hospital. The attending physician Zhao Cunyuan and his former colleague Li Jun each have their own secrets, and one picture leads to a shocking conspiracy of serial murders and collusion between government and businessmen. Can Chen Mo complete his counterattack in the psychiatric ward?
