The end of the world is hundreds of years away, and humans have already adapted.
The girl was always so perfect, and Ye Jun couldn't let her go, so he tolerated her "willfulness", but that willfulness became more and more strange, and that subtle look in her eyes always made him unable to refuse.
It turns out... I should have belonged to her from the beginning.
Intention: The end of the world is coming, and mankind will eventually come back.