I don't know what to say, other than this movie is not good, it is an overcomplicated mess, delving in unnecessary obscurity to induce confusion that leaves the viewer with questions rather than answers, which would have been a defining feature of the movie if only it was successful in tieing up plot points neatly. It had potential but chose to intentionally convolute the plot to create a sense of confusion with not an ounce of clarity, the idea and the core plot were impressive, but the unnecessary shot composition and arrangement of scenes spoiled it. I have watched many psychological horror movies, which had complicated plots but were superbly executed. This movie just leaves the viewer with a sense of dissatisfaction and confusion, the horror feels incredibly forced, it would have been way better if it had no supernatural elements at all, by leaving the audience with a notion that it was all in Su mi's head.