It tells the love-hate story of the adopted daughter of a general and the prince of Xi Rong. Li Shuang, the adopted daughter of a general, guards the frontier of Da Jin. One day, they came across the prince of Xi Rong, Ao Deng, who had disguised himself into a child of Zhong Gu, and named him Jin An. By day the prince played the role of the young Jin An, but by night he became the man in the black mask, helping Li Shuang to force back the Xi Rong army. Then on a cold winter's night in a snowy mountaintop one kiss changed everything, and through trials and hardships both would learn that in order to be together they must give up everything they hold dear.