During the Chongzhen reign of the Ming Dynasty, eunuch Cao Huachun colludes with the Qing dynasty to seize the throne. Princess Changping and her sister Zhaoren seek the help of Zhou Shixian and Yuan Ruofei to eliminate Cao. Li Zicheng's rebels invade the capital and are rescued by the East Sea Fairy, who teaches them martial arts. The Qing then conquer the Central Plains, and Ping and Shixian pretend to submit to the Qing to save Ruofei. However, they have their own hidden agenda.
