At the end of the Southern Song Dynasty, the Mongolian cavalry went south, causing chaos in the world. Shen Muzhou, an orphan from a small town in the south of the Yangtze River, spent his childhood practicing martial arts with his adoptive father, a retired bodyguard. Once he accidentally saved someone, he was involved in a dispute between the Canglang Sword Sect and the Mingxiao Sect, and obtained half of the fragmented book "Canghai Jue". His life experience is a mystery - his father is a "traitor" of the Canglang Sword Sect, and his mother is a survivor of the East China Sea. In order to find out the truth, Shen Muzhou stepped into the Jianghu, met Su Jinse, the only daughter of the Canglang Sword Sect, Ye Qingmei, the saint of the Mingxiao Sect, and became brothers with Lu Jiuyuan, the young master of the Zhenyue Sect. However, there is a hidden conspiracy in the martial arts conference. Gu Xichao, the shadow pavilion master of Tianshu Pavilion, appears to be benevolent and righteous, but secretly colludes with Mongolia in order to unify the martial arts. Shen Muzhou rebelled against his relatives and fled to the island. In a desperate situation, he understood the highest spiritual method of "Canghai Jue". When the truth came to light and the martial arts factions recognized Gu Xichao's true face, the Mongolian army had already arrived in Xiangyang. The good and the evil put aside their grudges and join forces to fight against the enemy. Shen Muzhou turned the tide with his own efforts, finally defended Xiangyang, carved "Canghai Jue" on the stone wall of Huashan Mountain, and floated away.
