What does the horror movie Red Heels mean at the end?

In fact, that movie is not a ghost movie, the front has been acting so that everyone thought it was the dancer ghost in the shoes in the murder is actually the sinful side of the Sun Chae, she found her husband had an affair with her husband after the use of cold air to freeze to death, in the underground subway found a female high school student wearing pink high heels, in order to get the pink high heels, killed the female high school student, her friend is the same, In Chul know the truth is also killed． Sun Chae looks at her other self． He is also schizophrenic Pink high heels is actually just an excuse． The root of the problem lies in the fact that Sun Chae suffers from a severe schizophrenic personality and her strong possessiveness. She has a penchant for collecting shoes, and her shoe cabinet, with its exquisite glass frames and crystal shelves, is a reflection of her love for shoes. Her daughter, too, is obsessed with shoes, especially brightly colored ones, so much so that she won't go to dance class without red shoes. However, her husband makes her lover wear her favorite shoes and praises her for wearing them more beautifully than Sun Chae, and although Sun Chae has not shown any anger up to this point, and seems to just calmly accept it all, it is all implied. Unable to get her husband's love, Sun Chae kills her husband with her own high heels, and this is before she meets the pink high heels, which proves that Sun Chae has already begun to move towards personality schizophrenia. And after meeting the pink high heels, it emphasizes her possessiveness, as long as it is something she wants, she won't allow others to snatch it, so she cuts off the feet of the high school girl, kills her best friend, her husband who betrays her, her daughter who goes against her will, and her lover In Chul who has already understood everything.