I recommend the novel Return of the First Generation Demon Emperor to you. The male protagonist was born from the heavens and earth. He conquered the Demon and Human races and swept through the gods and the heavens. He was invincible and was only half a step away from unifying the three worlds. However, because he fell in love with a girl in the human world, he was killed by the gods and possessed a young man named Dust, reopening his legendary path. The novel was a fantasy or oriental fantasy. The plot was similar to the novel in question. I hope you like my recommendation. Muah ~