The mysterious Lu family villa, also known as the Butterfly Mansion, is a notorious haunted house. Physiotherapy therapist Li Han and the scheming Awei move in one after the other. Afterwards, a series of bizarre events unfold: a woman in a red dress with a blood-stained headband wanders the rooms; a distorted, eyeless boy screams in agony… Awei's greed grows wildly as he sees greater profits, while Li Han is plagued by nightmares every night and unexpectedly stumbles upon a shocking secret of the wealthy family. Meanwhile, a life-or-death game is quietly being set up within the Butterfly Mansion. Who will be the lamb to the slaughter? Who will step into an even deeper hell?