Ari (played by Guo Jinan) and Ayue (played by Zhang Weijian), who were raised by the magical mother-in-law since childhood, are a pair of good brothers with different personalities. They have both practiced good kung fu and are very narrow-minded. They were named the Sun and Moon God by the emperor. In the process of wandering around the rivers and lakes, they met various strange people and strange things one after another, and met the rich lady Qiu Jingjing (played by Yang Ling), Jinhua, Yinliu and others. Ari and Ayue developed a tangled polyamorous love with them. Behind the seemingly fine background, there is a shocking secret, that is, the mystery of Ayue's life experience. It turns out that Ari and Ayue are both representatives of the battle between immortals and demons, but Ari is the son of Dao Banxian, who represents justice, and Ayue is the son of the demon. Ayue, who knows the truth, can't accept this fact. On the date approaching the 100th anniversary of the battle between immortals and demons, Ayue became a demon. The good brothers who used to be good brothers have now become irreconcilable enemies. Can the Sun and Moon Swords be combined again?