What is fetishism about?

Fetishism is a psychological suspense film. There are many controversies and explanations, and different people have different understandings after reading them. It's like saying that Song Hye Kyo Jing died or Julie died in the end? Is it a soul exchange or a body exchange or something? Actually, I don't quite understand .. I thought of another explanation. Is (Song Hye Kyo) as a witch, jealous of white Julie's life, and Julie is actually jealous of Song's hair and her infertility, that is to say, she is actually jealous of her body, so she may actually be dead, but Julie thinks she is, because she was stimulated to kill someone. She is crazy and thinks she is Pan Shiqi, just like Pan Shiqi has been imitating Julie. As for pregnancy, Julie may have been pregnant because of too much pressure, or she may have come back to conceive her because of a series of accidents. Infertility is a physiological problem, which is sometimes difficult to explain. However, the exchange of souls is relatively hanging, and novels and the like often appear, but I think my understanding is not unreasonable. After all, psychological problems are more likely than soul exchange, because there are really many examples of psychopathy and schizophrenia, which are understandable. All right! I'm just my opinion, I hope I can help you ~