This was a time-travel novel where the female protagonist fell into the water and her body transmigrated to an ancient lake. She met the male protagonist and fell in love with him. The male protagonist was the emperor. The story was about the female protagonist who accidentally traveled to ancient times and accidentally became the emperor's sister. After that, she met the emperor and fell in love with him. However, their identities and status made it difficult for them to be together. Through continuous efforts, the female protagonist finally overcame all kinds of obstacles and lived a happy life with the emperor.