In the novel " The Eldest Princess," the Eldest Princess was the female lead. She and the Crown Prince were siblings. The Eldest Princess was extremely beautiful and had a noble temperament, but her father did not like her because her mother died early. She had been bullied and neglected as she grew up, and her personality had become cold and tenacious. The Crown Prince was the Emperor's eldest son. He was intelligent and wise, and was highly valued and loved by the Emperor. However, because of his identity and responsibilities, he was under immense pressure and loneliness. In the novel, the relationship between the Eldest Princess and the Crown Prince was very complicated. There was kinship and love between them. The Eldest Princess had found warmth and support from the Crown Prince, and the Crown Prince had also found understanding and support from the Eldest Princess. However, due to their status and responsibilities, they could not be together. In the end, the Eldest Princess chose to sacrifice herself in order to protect the Crown Prince and the country's interests.