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In the chaotic times of the late Sui Dynasty, the tyranny of Emperor Yang led to abnormal changes in the dragon's veins. There is a rumor in the world that "the one who wins Longyuan will inherit the destiny", which attracts strong competition from all over the world. Li Liezhao, a young man from a poor family, accidentally obtained a fragment of the ancient divine weapon Long Yuan Sword, and was involved in the whirlpool of temples and rivers and lakes. He met Pei Wuyi, a ranger with a blood feud, and Dugu Hongyuan, a leader of the prairie who was proficient in mechanism skills. The three became sworn brothers and vowed to change the troubled times with their swords. At that time, Duke Li Yuan of the Tang Dynasty took advantage of the situation to raise troops, and the heroes of Wagang gathered to rebel against the Sui Dynasty. In the dark, there was a mysterious organization "Xuan Ye Pavilion" controlling the world chess game. Li Liezhao and others circled among the princes and Jianghu forces, breaking conspiracies, killing evil dragons, and breaking into the imperial tombs, but gradually discovered the real secret of Long Yuan Sword - it was not an imperial weapon, but the key to suppress ancient evil spirits. When their great cause is about to fall, the three of them face a choice: help Li Shimin achieve the prosperous age of Zhenguan, or destroy the sword to stop the demon, at the cost of their own souls...