Lin Mo, an intern psychiatrist, entered the eerie Qingshan Mental Hospital for an internship in order to find his missing grandfather. It seems normal during the day, but strange things happen frequently at night - women cry from the corridor, lights in empty wards automatically turn on, rag dolls open their eyes in the middle of the night, and patients disappear inexplicably. With the secret help of nurse Chen Shouyi, Lin Mo followed the clues left by his grandfather and gradually uncovered the secrets of the mental hospital: many years ago, this place was a haunted house during the Republic of China, and was later transformed into a mental hospital. In order to cover up the truth about illegal experiments, Director Li killed Lin Mo's grandfather who knew about it, and also used folk magic to suppress the ghosts of the dead patients. Li Xiulan's rag doll was the relic of the little girl who was killed that year. Lin Mo and Chen Shouyi joined hands to fight against the evil spirits, collect evidence of Dean Li's crime, and eventually clear the wrongs for his grandfather and the dead patient. However, they discovered that the strange things in the mental hospital were not completely over.
