Emma is just a daughter of her own future that she fantasizes about.
All the fantasies of a series of details of life are just pieces of the ordinary life of her and her friends.
Before Diana died, she thought that her conscience would be uneasy in 15 years, and that she would not live well, so she made a choice and decided to let her classmates kill her.
So it was Diana herself who died in the end, not her friend. All 15 years from now, everything is just fantasy.
Some of the flowers that have been drenched by the rain will be smashed by the rain, while those that survive are more beautiful.
Diana thought that instead of surviving on her own, if it would not be so beautiful, she might as well choose to let the rain smash herself and let her friends Live more beautifully. The opening song of the film has already revealed all this.
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