Thousands of years ago, two dragon ancestors worked together to create this world. The dragon clan is the king of this world. They can fly freely in the sky, overlook the earth, and rule the ocean. Everything in the world is owned by the dragon clan.
But some dragons couldn't survive because they couldn't adapt to the environment of this world. The Dragon Ancestor used his own energy to turn the dragons who couldn't adapt into human form, and gave them dragon energy, so that they could continue to survive in the alien world. The hybrids of dragons and humans - the dragon people.
The two Dragon Ancestors had a dispute over this. One of the Dragon Ancestors believed that the Dragon People who could not adapt to the environment were weak and troublesome existences and planned to eliminate them, but the other Dragon Ancestor hoped to live together with the Dragon People in the alien world.
The two Dragon Ancestors were therefore divided into black and white factions and fought continuously. In order to protect the alien world, the White Dragon Ancestor used his greatest strength to create the 9 strongest life forms that were a fusion of humans and dragons - "Dragon Sons".
The nine dragon sons then taught the dragon people how to control dragon energy in battle, allowing them to protect themselves and fight together in the alien world.
The Dragon Ancestor calls them "Dragon Envoys" who can control the dragon energy to fight and protect the envoys of the alien world.