Do you know what an ancient novel about immortals is? It wasn't a transmigration story.

The female protagonist was a princess of a country. The male protagonist was the emperor of this country and the princess's elder brother. They fell in love. However, the princess married a foolish emperor of another country for her country and her elder brother. Later on, her elder brother was killed for treason. This foolish prince gradually became smarter. Actually, this story was a bit like an immortal. Actually, this foolish prince was another body of her elder brother. They were both immortals in the sky. In order to be together, the two of them descended to the mortal world together to receive experience. Although the lord's imperial brother had died, the soul of that imperial brother had returned to the body of this foolish emperor. That was why this foolish emperor had become smarter. When the princess found out that her royal brother had been killed, she returned to her own country and hugged her royal brother's corpse tightly. Later on, it was the foolish emperor who had become smarter and said in her ear,"XX (I forgot what these two words are. It seems to be the name of the royal sister or the female protagonist). You're hurting me." Only then did the princess let go. However, the princess did not return to the palace with the foolish emperor. Instead, she stayed in a courtyard by herself. Moreover, she was blind. It seemed that he had even stabbed that stupid emperor with his sword. In short, in the end, the male and female protagonists got together. It seemed like they had gone through three or several tests. He had forgotten. To find this book, just ask for the title. I give extra points to the first person who answers correctly