I think the reason for the original sin is that they are not the same kind of people, but they are in love with each other. Different forces from the male and female protagonists pull them in different directions. In the end, the male protagonist is pulled into the abyss by the dark power of the female protagonist, and they are finally together. But it's not a bright future, and it's a frustrating cheating career. How is this ending different from the behavior of the heroine and Billy at the beginning? Therefore, this is the original sin, and the fact that people from different worlds fall in love is the original sin.
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