The Princess is a Rabbit Fairy.

The little rabbit fairy Bai Zaizai, in order to avenge his master, accidentally broke into the palace and became the bodyguard of the second prince Liu Changge. In the process of getting along, the two went from getting to know each other to slowly falling in love. Liu Changge helped Bai Zai Zai avenge the murder of his master, and Bai Zai Zai also helped Liu Changge, defeating the National Preceptor Shen Yi and other princes in the dangerous palace.