In order to raise money to save her younger brother, Lin Wei was forced to enter the isolated Qingwushan Mental Hospital and became a night shift nurse. On her first day of employment, the dean issued a fatal order: it is strictly forbidden to violate the "Night Inspection Manual", especially Article 7 - "The red light in Ward 302 must never be turned off." She soon discovered that the rules here were cold to the bone, and violators disappeared "accidentally". Through the crack in the door of 302, she actually saw the investigative reporter who was supposed to be "missing" and a shocking clue related to her mother's disappearance. The warning note left by her mother led her to a shady story that had been buried for many years: the hospital actually conducted illegal drug experiments using patients and nurses as test subjects. Under the red light, it is not the ghosts, but the human heart that is more terrifying than the ghosts. Lin Wei must deal with ubiquitous surveillance and lies, exploit loopholes in the rules, unite imprisoned victims and conscientious resisters, collect evidence, and fight back with all her might. Not only does she want to uncover the truth behind her mother's disappearance, but she also wants to personally destroy this hell on earth cloaked in benevolence.
