Behind the doors of Namwon Hospital lies a chilling secret, one that the hospital’s inhabitants have kept buried for the last 10 years, and all centered around one coma patient, Lee So-hee. With the hospital’s reputation steadily declining over the years, it is forced to shut down. Though as the hospital closes its doors, another opens, and secrets that have long been hidden are coming out with a vengeance.
Min-ah discovers a scarlet-covered diary as she is hurrying to school. She has a brief hallucinatory experience when she opens it, initiating a series of strange occurrences which eventually draw Min-ah into the eerie world of the diary. In her desire to find out more about the diary, Min-ah feigns an illness, getting permission to lie down in the school's clinic. There she witnesses the reunion of Hyo-shin and Shi-eun... The day in the girls' high school is half over, and the students are preoccupied with the trauma of getting their physical checkups. Suddenly their hustle and bustle is abruptly interrupted by a sharp scream which announces the death of Hyo-shin... Soon, her ghostly entity will linger over everyone's secret..