The great empire of the Ming Dynasty is struggling with many problems. The economy is weakening, the people are rebelling, and foreign powers are growing increasingly threatening. The most dangerous enemy, however, is the Valla state. The emperor is forced to marry his beautiful daughter, princess Jingning to the prince of Valla. He entrusts his daughter to Yun Xiaotion, the bravest and most talented swordsman in his empire, to deliver her safely to the prince. He has no idea that the swordsman is in love with his daughter.