Bai Zhenzhen, the adorable and somewhat absent-minded daughter of a military general, seeks the heir apparent's help to save her wrongfully imprisoned older brother. However, she enters the wrong room and mistakes the Crown Prince for the heir apparent. After the two are set up and forced to spend the night together, the Emperor learns of the incident and immediately arranges their marriage. After the wedding, the Crown Prince uses every means at his disposal to force Bai Zhenzhen to divorce him. But when she finally loses all hope and takes the initiative to request a divorce, the Crown Prince, who should have gotten exactly what he wanted, unexpectedly regrets it.