Dark River, the most mysterious assassin organization in the Jianghu, is composed of the three families of Su, Xie, and Mu. The highest commander of the three families is called the head of the family. The head of the family was poisoned and his life was in danger. After the three forces of Dark River learned the news, they took the opportunity to launch a rebellion. Su Muyu, as the leader of the head of the family's guard group, Zhuying, asked Bai Hehuai, the genius doctor of Yaowang Valley, to treat the head of the family, while repelling the assassins from various families to protect the head of the family. At this time, his good friend Su Changhe in Dark River joined the action of assassinating the head of the family on behalf of the Su family.