I understand it this way: in fact, the film is a soul exchange to show personality transformation. The heroine and the lawyer were not really swapped souls, but when they were in that powerful atmosphere of psychological suggestion, there was a “hysterical” attack, and the “personality transformation” symptoms. They believed that they were possessed by two old shamans and that they had become old shamans, so they began to imitate the old shamans in their minds, words and behavior. Therefore, the people chosen by the witches have to believe in witchcraft so that they can be easily hypnotized, and after hypnosis they can convert their personality, and in this way the witches live forever. In fact, there are constantly people who believe in the story come forward to play the wizard. After the personality transformation, the old lady and the old man choose to play the role of the young nurse and the lawyer who are being witchcrafted. So, this is a film about “dissociative disorder”, and the main symptom presented is “possession”. Of course, beyond the disease, it is about the powerful role of the psyche, how the subjective mind transforms the objective world.