Can you recommend a novel that you've read before? In the novel, the levels of martial artists include the earth, sea, sky, and divine levels.

The plot was like this: The protagonist was a prince of a country who used to be a good-for-nothing. When he was 14 years old, he had a dream. In the dream, he was the son of a martial arts family. His father was a top master in the world. Later, another master came to challenge his father, and he woke up. After he woke up, he learned the martial arts of his family in his dream. At this time, their country was fighting a defeat, and his father died in the battle. At that time, there were seven countries on the continent, and one of them had a marriage alliance with their country. The ranks of martial artists seemed to be Earth Warriors, Ocean Warriors, Sky Warriors, and Divine Warriors. The title of the book?