Shaonian Ge Xing: Anhe Zhuan

An assassin group known as Dark River is composed of three families: Su, Xie, and Mu, each led by a head, with the highest authority being the Great Chief. After the Great Chief is poisoned and his life becomes critical, the three families see an opportunity and begin a rebellion. Su Muyu, who leads the chief's personal guard unit called Spider's Shadow, searches for Bai Hehuai, a renowned healer from Medicine King Valley, to save the chief while fending off assassins from the rival families. Meanwhile, Su Changhe, Su Muyu's closest ally within Dark River, sides with the Su family and participates in the plot to kill the Great Chief.