The evil king Shi Zhixuan is a martial arts master, but he is afraid that his evil martial arts will bring disaster to the world in the future, so he freezes himself and the evil emperor's relic that contains great martial arts in the evil king's tomb. The only key to enter the evil king's tomb is the secret book "Eternal Life Secret" which records the superior martial arts, so everyone in the world wants to get it, but it has been lost in the world for many years and no one knows where it is. On the other hand, Kou Zhong (played by Lin Feng) and Xu Ziling (played by Wu Zhuoxi), two orphans in Yangzhou City who have been dependent on each other since childhood, have been doing some petty thefts to make a living, but they are both talented and hope to learn good martial arts in the future, so they want to worship the local Taoist priest Shilong as their teacher. Unexpectedly, when they went to find Shilong, they found that Shilong was fighting with a woman with strong martial arts skills, Fu Jun'er. It turned out that Shilong stole the "Eternal Life Secret" that everyone in the world wanted from Fu Jun'er. After a fierce fight, Fu Jun'e retrieved the Secret of Immortality, but was also seriously injured. Kou Zhong and Xu Ziling fled with her. At this time, the imperial guards led by Yu Wenzhi came to rob the Secret of Immortality. Fu Jun'e knew that if the three of them left together, they would definitely not be able to escape, so she gave the Secret of Immortality to Kou Zhong and the other two for safekeeping, and then she led the pursuers away alone. Kou Zhong and Xu Ziling, the self-proclaimed Yangzhou Twin Dragons, began their journey in the rivers and lakes.