Ah Ri (played by Guo Jinan) and Ah Yue (played by Zhang Weijian), who were raised by their magical mother-in-law since childhood, are a pair of good brothers with different personalities, both of whom have practiced good kung fu, and they are also extremely narrow-minded, and they were crowned as the Sun and Moon Heroes by the emperor. In the process of wandering the rivers and lakes, they have met all kinds of strange people and strange things, and got acquainted with the daughter of the eldest lady Qiu Jingjing (played by Yang Ling), Jinhua, Yinliu and others, Ah Ri and Ah Yue developed an entangled polyamorous love with them.　　Behind the seemingly unharmed everything, there is a shocking secret hidden, that is, the mystery of Ah Yue's life experience. It turns out that Ah Ri and Ah Yue are both representatives of the Immortal and Demon War, but Ah Ri is the son of the Dao Half-Immortal who represents justice, and Ah Yue is the son of the Demon Venerable. Ah Yue, who knew the truth, couldn't accept this fact, and on the date of approaching the centennial anniversary of the Immortal and Demon War, Ah Yue became a demon. Once a good brother, but now he has become an old enemy who shares the sky. Can the Sun and Moon Excalibur be combined again?