Dark River, the most mysterious assassin organization in the jianghu, consists of three families, Su, Xie and Mu, and the highest commander of the three families is called the Great Chief. The head of the organization was poisoned and his life was in danger. The three forces of the Dark River learn the news and take advantage of the opportunity to launch a rebellion. Su Muyu, as the leader of the chief's escort group Spider's Shadow, sought out Medicine King Valley's miracle doctor Bai Hehuai to treat the chief, while repelling the assassins of all the families to protect the chief's safety. But at this time, his best friend Su Changhe in Dark River joined the assassination of the great chief on behalf of the Su family. (Source: Youku)