A heavy, oppressive atmosphere fills the wards of an ancient hospital, cut off from the outside world. Psychiatrist Ye Xiu has had the rare ability to enter the subconscious mind since childhood. When a treatment session reveals a clue connected to his parents' mysterious disappearance, and patients continue arriving stripped of their will to live, Ye Xiu begins peeling back the layers of a buried truth — one unconscious mind at a time.