In the Wanli year of the Ming Dynasty, Japanese pirates conspired with spies in the court to frame the entire family of the Minister of War, Lord Qiu. However, his youngest daughter, Qiu Moyan, was saved by the martial arts hero Zhou Huai'an. Before his death, Lord Qiu handed over the Ming Dynasty coastal defense plan to his daughter, hoping toAt the time of the Qingming Festival in the court, entrust the defense plan that concerns the safety of the Ming Dynasty to someone who can shoulder the great responsibility. The Japanese pirates pursued and killed Zhou Huai'an and Qiu Moyan in the martial arts world in order to obtain the defense map, and the court also listed them as heavenly charactersThe first wanted criminal, in order to set up a defense plan and ensure the safety of the descendants of the Qiu family, Zhou Huai'an sought the help of the owner of the Longmen Inn, Jin Xiangyu. Jin Xiangyu hid the defense plan in the inn for his beloved, and changed the innLike a dragon boat hidden outside the rivers and lakes, protect the defense map before the appropriate time arrives. However, unexpectedly, Qiu Moyan fell into the hands of the Japanese pirates. At the same time, the court also dispatched a skilled detective named Xu YilaiArriving on the ship to capture Zhou Huai'an and Qiu Moyan, several forces engaged in a desperate struggle on this eerie dragon boat for their respective purposes.