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During the Nanchen period, Cheng Lingshan, a high disciple of the Qingzhu sect, rescued the mysterious woman Gao Zhiqiao in the desert of the Northern Qi Dynasty by chance. Because of this woman, Cheng Lingshan gradually uncovered the grievances, resentments, love and hatred caused by the split between the north and the south... At the same time, Xu Ensu, the young city lord of Goguryeo, was a member of the assassination organization and was ordered to go to the Central Plains to assassinate Cheng Lingshan. However, due to national interests, he was forced to cooperate with Cheng Lingshan, and has been involved in various disturbances... A rainbow sword will lead to bloody turmoil in the martial arts world...