In the fourteenth year of Yonggu's reign, Xianbei was defeated by the Han Dynasty, and the third prince Tuoba Lin was sent to Beijing as a hostage. After the reception banquet, Tuoba Lin accidentally broke into the royal harem and was rescued by the eldest princess Liu Langyi. The two gradually fell in love while investigating the cause of the late queen's death. At this time, news came that King Xianbei had died, and the nobles were fighting in separate factions. Tuoba Lin asked for orders to return to Xianbei to quell the civil strife. But they didn't expect that this separation would actually be the beginning of the difficult love between the two for many years...