Contains science fiction, ethics, love elements, full of fatalism. Everyone tries to do what they think they should do, but no matter if they take the initiative or are pushed by others, they can only do what has been set. The ending is a bit rushed, but the story is complete without loopholes, and it is family and love that break the fate. The ending of the male and female protagonists is quite touching. It feels a bit like the situation of the first male protagonist of the butterfly effect, that is, he keeps trying to correct all this, but finally finds that his birth was a mistake.
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