Find a novel, starting with the story that the protagonist and his classmates went out to travel and fell into a crack on the snowy mountain. There was a dragon and the prince of the dragon kingdom we

Find a novel, starting with the story that the protagonist and his classmates went out to travel and fell into a crack on the snowy mountain. There was a dragon and the prince of the dragon kingdom went. ... I seem to have read this book. . . Did the protagonist go to another planet or another continent or something to help his two newly recruited brothers there unify the country? Finally, he is still struggling with which is the emperor, the fierce war or the ability to govern the country? Finally, the military and the government separated and let his brother cross the earth to help him solve the alien problem, right? It seems that Pangu gave him an axe and a training method. He must have told Pangu to mix with Yuan Gong or something. What's even more awesome is that the demons of the protagonist are actually rational! ! ! ! ! But also reached an agreement with the demons to take over the body for three days in turn! ! Double soul! ! ! And the demons fell in love with a girl! ! ? Lying in the trough, this dog blood, I took it. If I remember correctly, the protagonist is Wu Hao, and the title is Dragon Boy.