Forensic doctor Lin Wan dissected a strange male corpse. There were no external injuries on his body, and his death was extremely frightening. In the brain, there remains a brainwave that does not belong to humans. At the crime scene, there was only a blank tape. White noise sounds and the next dead person appears.
As the investigation continues, all clues point to the abandoned Hospice Mental Hospital 30 years ago. The master is hiding something, the criminal police are escorting him, and the mysterious man is closing in on him step by step.
Until she discovered that the tape contained the voice of her mother who had been missing for thirty years.
Under the abyss, it is not fear. It was something she had never dared to imagine, the truth.
