Bei Yurui, a first-year high school girl from Renqi Hospital and a little piano princess, fell in love with Yu Yazhe, a little comic prince in the same class, but Yu Yazhe pushed her to his good friend Yan Zhanfeng. Later, they traveled to ancient times and the two lovers became two princes and princesses of an enemy country. What will their fate be like? What is waiting for them in ancient times?