Ning Yi, a grassroots boy from Xiling, possesses a special gluttonous physique. He lives with Pei Fan, who bears a blood feud with him. Later, he becomes bound to the mysterious girl Xu Qingyan because of the rare treasure, the bone flute. Xu Zang, the sword immortal of Mount Shu, teaches Ning Yi the way of the sword to perfection, and the bone flute helps him become a sword-wielder, shouldering the responsibility of saving the people of the world and the light.