Li Changge, the daughter of the former crown prince, escaped from the military coup in palace. She encountered the secret service agent of a grassland tribe, Ashina Sun. Changge smashed a conspiracy, but revealed her identity. She escaped and hid herself beside Gongsun Heng, helping him resist the invasion of grassland force, but did not expect the general of enemy was Sun. The situation in Yuzhou worse. In order to gain time, Changge was taken to grassland as a prisoner. She gradually understood the invincibility of benevolent, and put aside her personal grievances.