In a romance novel, the female protagonist is called An Yimo, and the male protagonist is brother and sister.

Alright, I can help you summarize the plot and content of this romance novel: The background of the story was a fictional ancient dynasty. The male and female protagonists were both members of the royal family. The male protagonist was the emperor's sister, and the female protagonist was the prime minister's daughter. The main story was about the male and female protagonists growing up together, supporting each other and relying on each other. However, as their feelings for each other developed, their relationship gradually became complicated. In the story, there was a special relationship between the male protagonist and the female protagonist. The male protagonist was the female protagonist's cousin. Although they were not blood brothers, their blood relationship could be traced back to their ancestors. The male protagonist fell in love with the female protagonist at first sight and decided to pursue her. However, the female protagonist did not accept his pursuit because she already had a boyfriend and she also knew the identity and relationship of the male protagonist. The male protagonist did not give up. He had been silently protecting the female protagonist and trying to make her change her mind. In this process, the male protagonist gradually discovered that his feelings for the female protagonist were not just ordinary family love, but deeper feelings. However, the female protagonist's feelings were equally sincere. She did not accept the male protagonist's feelings because she knew that her love did not match the male protagonist's identity and status. At the climax of the story, there is a fierce conflict between the female protagonist and the male protagonist. The male protagonist tries to make the female protagonist his queen through political means, but the female protagonist finally decides to leave the court and leave the male protagonist. Although the male protagonist was very disappointed and painful, he did not give up. He decided to use his actions to prove his ability and value in order to win the female protagonist's respect and trust. The ending of the story was that the male and female protagonists finally reunited, and the female protagonist forgave the male protagonist and told him her feelings. The male protagonist also realized his mistake and decided to let go of the past and spend the rest of his life with the female protagonist.