At the end of the Tang Dynasty, the country was in chaos, with separatist regimes and many heroes rising up. It is said that before the Huang Chao rebels captured Chang'an, the mysterious organization Bad People in the government had carried out their last mission and then disappeared. Almost at the same time, the national treasure that the rebels had searched Chang'an for was also missing. Since then, a rumor has spread in the world that there is a huge secret hidden in the legendary Longquan Sword. Until one day, a mysterious orphan named Li Xingyun was rescued by the hermit Yang Shuzi by chance and became his disciple to learn martial arts. A few years later, Li Xingyun and his apprentice sister Lu Linxuan went down the mountain to practice, and met two good friends Ji Ruxue and Zhang Zifan on the way, and later accidentally got the legendary Longquan Sword. As a result, Li Xingyun and Longquan Sword attracted the covetousness of many sects, including Xuanming Sect, Tongwen Hall, Huanyin Square and Tianshi Mansion. They used all kinds of tricks, such as plundering by trickery or hunting down, and even the long-lost bad guys showed signs of reappearing. Li Xingyun, a young man with a mysterious background, and his friends were dealing with the dangerous rivers and lakes, struggling hard to find a way to survive.