Personally, I think the core of the film is that the beauty of youth is love. Youth without youth, the name of the film preaches a theme, without love in youth, the beauty of youth is lost. The male protagonist gave up love, and when he was lonely and old, he returned to youth and found love. The surrounding of this core is full of human cognitive depth, and under the fantastic appearance, it is still the same deep and happy. In short, a movie with too much philosophical seeming oddity doesn't have a profound or unrecognizable themes and descriptions of its own.
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