Yu Mingyi believed that the most carefree among the Yu family was Youngest Brother Yu. Youngest did whatever he wanted, no matter how much he was beaten or scolded by their father. He lived according to his own desires. When Father Yu wanted him to become a pilot, Youngest pretended to comply obediently, but at the last minute, he made his own decision and signed up behind their father's back.
He made the move first and reported later, leaving Father Yu with no recourse.
As for Yu Mingyi, he had abided by the rules all his life and lived as his parents demanded. When his father said to take the pilot's exam, he did, and when his mother said it was time to start a family, he obeyed. He originally thought that if he did everything according to his parents' wishes, they would be happier, but he realized things weren't that simple.
He still caused his parents to worry.
"Uncle, what's wrong with you? Aren't your health checks at work always good?"