Zhang Xiaofan (Li Yifeng), who along with childhood friend Lin Jingyu (Cheng Yi), are the sole survivors of a village massacre. The two are later accepted into the Qingyun Sect (Noble Sect), where they learn the ways of the Immortal Sword. Although hard-working, Xiaofan struggles to catch up to his peers due to his slow wit. Fortunately, he has the support of Bi Yao (Zhao Liying), daughter of the Ghost King (Fu Chengpeng), who supports him through thick and thin. Pivotal circumstances made Xiaofan grow, and his relationship with Bi Yao takes a meaningful turn. For power, the villainous Ghost King attempts to overthrow the Qingyun Sect, and Xiaofan gets his life on the line. Bi Yao sacrifices herself to save him, falling into an endless sleep. With courage and strong faith, Xiaofan devotes all his strength to take down the Ghost King, fulfilling a promise he made to Bi Yao and Jingyu when they were youths.