The four brothers of the Tang family are the four brothers Laowang, also known as the Dragon Kings of the Four Seas. The eldest son is the Qinglong King of the East China Sea, and he is famous. The second is the Red Dragon King of the South China Sea, named Zhou. The third one is the White Dragon King of the West Sea, named Qi. The fourth son is the Blue Dragon King of the North Sea, named Qing. But in fact, they were supposed to be five brothers, but the latter was born with a black body. According to the Dragon Clan's Desolation Code written by the ancestor of the Dragon Clan, the black dragon is the body of the devil, and the body of evil should be hoeed to avoid serious trouble. In the dragon clan, the length of the dragon's horns has always been used to determine the level of spiritual power. The black dragon king's dragon horns are naturally superior to those of the other four brothers, and his spiritual power is on par with his father, the yellow dragon king.