After the ancient Emperor defeated the demons, the shattered sword was broken into two parts. Two sword spirits were born – Zhaoyun and Muyun. However, due to the chaos caused by the battles, the two brothers were separated since birth. Zhaoyun was raised by a group of warriors called Flying Feathers, in charge of aiding Gong Yangxiang’s quest to expand the Kingdom of Xiaoyue; while Muyun 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 Zhaoyun discovers the truth, he uses their bloodline to save Muyun from danger.