Ouyang Wuhuan, who lost his parents in the war, and his only biological sister Du Xiaoshi were forced to separate. Wuhuan was fortunate enough to be raised by the martial arts leader. By chance, Wuhuan met Murong Piao, a swordsman who was wandering the rivers and lakes. When the relationship is deep, Du Xiaoshi breaks into the two of them. The innocent and romantic Du Xiaoshi is very obsessed with Murong Piao, and how to solve the mystery of Wu Huan and his sister Xiao Shi's life experience, and where will the relationship and destiny of the three people go...