Please recommend an ancient novel where the male and female protagonists are childhood sweethearts.

The male protagonist's crown prince was eccentric and didn't like to study when he was young. The female protagonist was the daughter of a minister. She liked to study and liked the outside world. The female protagonist was very liked by the empress dowager. She even gave the female protagonist a ring and had the right to divorce her husband. The male protagonist liked the female protagonist. Later, a person from a country came and told the female protagonist that he could go out with her. The female protagonist agreed. Later, the male protagonist didn't agree. Later, the female protagonist "divorced" him. When the female protagonist was about to go out and make a living, she realized that she liked the male protagonist. In the end, the two of them got together. Which novel do you want? I read it a long time ago, please look for it.