Such novels were usually called " The Princess of a Subjugated Country " or " The Cold Princess of a Subjugated Country ". It was a classic time-travel novel that told the story of the female protagonist who traveled to ancient times to become a princess of a subjugated country. She encountered all kinds of misfortune, but finally obtained happiness and respect through hard work and intelligence. The male lead was usually an emperor who made the female lead queen in revenge, but the two of them separated because of a misunderstanding, and then gradually resolved the misunderstanding and re-established their feelings. This novel was once popular and loved by readers.