The Centaur

The Centaur summary:

Due to urbanization and warfare, the places where humans once lived had turned into deserts. When Martin–a young researcher–and his team were exploring the desert, they were ambushed by a huge monster and he was separated from his team. Fortunately, he was rescued by a mysterious centaur, who then protected him as he found his way back. Eventually, Martin discovered the secret of centaurs and world transmutation. None of them seems coincidental