As an ordinary student, Cen Yan is often awakened by nightmares at night, in which he kills people with a knife. Cen Yan was unbearable and her condition improved after undergoing psychological consultation online, but she unexpectedly dreamed that she had killed her friend Chen Wan. Chen Wan suddenly died in a different place, but the police determined it was a suicide. Only Cen Yan, who experienced becoming a "murderer", knew that this was a premeditated murder that took more than ten years. Faced with the suspicion and distrust of friends around him, Cen Yan gradually gave up his explanation. But while attending Chen Wan's funeral, Cen Yan discovered clues, but at this time she and Chen Wan's sister Chen Jing were imprisoned in the Chen family's woodshed. With the help of her ex-boyfriend who suddenly appeared, Cen Yan escaped successfully. While recuperating in the hospital, a note appeared out of thin air that made Cen Yan realize that the matter was not over. The dream and confession in the western restaurant allowed Cen Yan to discover the truth behind the death of "Chen Wan" and confirm her suspicions about her ex-boyfriend. Troubled dreams and strange fragrances, what finally surfaced were the evil consequences planted by the three of them. Behind the gentle and considerate but manic ex-boyfriend is a nightmare that Cen Yan can't get rid of.
