“Dark River”, the most mysterious Assassin Organization in the Martial World, consisted of the Su, Xie, and Mu families. The supreme leader of the three families is called the patriarch. The family's third elder was poisoned and their lives were at stake. After hearing this news, the three forces of Dark River took the opportunity to launch a rebellion. Su Muyu, as the leader of the patriarch's guard group, “Spider Shadow”. Recruited Bai Hehuai, a genius doctor from Medicine King Valley to cure the patriarch, and at the same time repelled various assassins to protect the patriarch Zhou Quan. Currently, it was his good friend Su Changhe in Dark River who joined the assassination of the Patriarch on behalf of the Su family.