Seeking the title of the book, science fiction, romance

He couldn't remember the specific story of the male and female leads. The side story was about the male lead's parents. The background was that Earth was discovered by a space civilization. As a third-class citizen, he joined an alliance and worked in the Universe Alliance with a work visa. His mother was an Earthling and was forced to marry his father. In order to level up Earth, his father cheated on his mother and his mother died after leaving. The author also wrote a novel about the male lead's mother's death and transmigration. The scumbag father was not the male lead. There was another special story in the novel. After the Earth was colonized, the Earthlings sent out countless spies. In the end, a female spy obtained a method to change the genes of the Earthlings through reproduction, thus becoming a second-class planet. Therefore, the government sent a large number of female spies and gathered a large number of girls to work in the foreign service, giving birth to alien children to improve the genes of the mother planet. Then, the story of the female spy and the alien. The female spy had accompanied the alien for 20 years, and after she retired, she found out that she was pregnant and gave birth to his child. In fact, the alien had feelings for her, but when he realized that she did not love him, he gave up on her and returned to his own planet. Her child took over her position and dedicated his entire life to serving the outside world. The female protagonist or male protagonist's mother was persuaded by the daughter of this female spy to marry. In order to raise the level of Earth, so that Earth had legal rights, and not a third-class colonial planet, so that the people of Earth had the legal right to defend themselves and counterattack. I can only recall so much. The story of the male and female leads and the story of the male lead's parents, I'm a little confused. He only remembered that the female spy's surname was Li. Ask for the title of this book or the author of this series.