After some exploration and searching today, I found the former space agency. When he faced a global lack of oxygen, threatening the survival of mankind, when his daughter wanted him to stay, he made a choice-to go to a planet outside the galaxy.
In the end, the male protagonist was more than 120 years old and still had black hair, but his daughter was old and had his own children and grandchildren. The daughter didn't want her father to send herself away. She felt that everyone would be with the family when she left, and then asked the male protagonist to rescue the female protagonist.
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