Milo, a half-human and half-god, did not hesitate to train himself hard in order to become an excellent knight, but accidentally became the legendary Dragon Knight. When selecting the captain of the Hal Empire Dragoons, he met Xie Sihan and "Guangyin" and joined the Dragoons together. In a battle between humans, demons and dragons, the righteous Ronasius, for various reasons, turned from darkness to light, and forged a deep friendship with the other two protagonists. The whole story starts from here...