After the ancient Emperor defeated the demons, the shattered sword was broken into two parts. Two sword spirits were born - Zhao Yun and Mu Yun. However, due to the chaos caused by the battles, the two brothers were separated since birth. Zhao Yun was raised by a group of warriors called Flying Feathers, in charge of aiding Gong Yang Xiang’s quest to expand the Kingdom of Xiaoyue; while Mu Yun was under the Bronze Bird army of Wei Kingdom, who are cruel and oppressive, and often invade the neighboring countries. The two brothers were reunited in a battle between their kingdoms. When Zhao Yun discovers the truth, he uses their bloodline to save Mu Yun from danger.
