Atmospheric Korean horror. When a childless couple decide to adopt a young orphaned boy, they think that their family is complete. But when they unexpectedly have a child of their own, their adpoted son becomes withdrawn and solitary. Eventually he becomes convinced that an acacia tree in the garden is the reincarnation of his real mother. At first his parents see this as another example of his growing fantasy world, but when the boy mysteriously disappears, they begin to fear that the tree in the garden may harbour dark secrets.