The story takes place at the end of the Tang Dynasty. Zhu Wen, who had evil intentions, rebelled and attempted to seize power and usurp the throne. He eventually killed Tang Zhaozong Li Ye and successfully replaced him on the throne. The Tang Li family suffered a heavy blow and disappeared from the world along with the mysterious organization "Bad People" that once belonged to the government. At the same time, the whereabouts of the mysterious Longquan Sword was also unknown. The Longquan Sword contained the secret of the national treasure. It is said that only the blood of the Li family can solve this mystery. The tenth prince Li Xingyun (played by Zheng Yecheng) was lucky to escape this disaster. He and his junior sister Lu Linxuan (played by Li Chun) lived an anonymous life with their master Yang Shuzi. However, when Li Xingyun and Lu Linxuan stepped into the world of martial arts again, the gears of fate began to turn. They met Zhang Zifan (played by Fan Shiqi), the young master of Tongwenguan, and the maid Ji Ruxue (played by Cai Wenjing). The four became close friends and were later involved in the vortex of open and secret struggles among the major gangs.