It was common for the male protagonist to be a prince in time-travel novels. Usually, it involved time-traveling to a world with a different historical background and discovering that he had become the prince or a substitute for the prince. In this story, the male protagonist usually experienced many challenges and difficulties, but through continuous hard work and learning, he finally became a successful person. This kind of plot usually involved topics such as love, power, honor, etc. It allowed the readers to feel the life experiences and values of different historical backgrounds.