Ni Hong, who was unprovokedly involved in a murder case due to the death of her dean, was sent to the psychiatric department of the hospital for treatment on the night of the murder. During the process, her pursuer Xiao Ye, who had been stalking her, disappeared, and her attending doctor, Dr. Ming, was even more mysterious - in order to detect the case. During the case, she also met the policeman Mo Ting and became friends with him like enemies. However, as time went by, people around her died one after another - the fate of her life was ups and downs, the truth of the case was confusing, and a greater danger was quietly approaching them. . . . . .