The plot is fixed on the warm scene where the heroine accompanies her mother to leave the cemetery. From the moment the phone is connected, everything she experiences after that is a nightmare for the heroine.
Because of the nostalgia for his late father, he brought his father back to life through the second daughter. Although they spent a while together, they finally returned to their original state. The movie seems to want to tell you that if you want to achieve your goals by means of crossing time and space, the ending can only be an empty dream, and maybe it will be a nightmare! If it is a gain, then it is to restore the memory of the father's death and the guilt of the mother!
As for the final reversal of the movie, in my opinion, it is purely superfluous! Invert for inversion's sake!
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