Ning Yi, a commoner from Xiling, possesses a special gluttonous physique. He relies on Pei Fan, who is burdened with a blood feud, for survival. Later, he becomes entangled with the mysterious girl Xu Qingyan through the rare treasure bone flute. Xu Zang, a sword immortal from Shu Mountain, teaches Ning Yi the ultimate swordsmanship, and the bone flute helps him achieve the honor of being a swordsman, bearing the responsibility of saving the world and bringing light.