After resigning from her job, forensic pathologist Jiang Xingzhou takes over an old hospital slated for demolition and accidentally discovers that he can hear the "last words" in case files. Nurse Gu Mingyue sneaks into the hospital to search for her missing sister, and together they open sealed medical records. A nonexistent ninth floor, operating lights at midnight, wristbands bearing false names: every clue points to a fire erased from the record ten years ago.