Metamorphosis War Master

The son of the devil is responsible for opening the door to the devil. In order to fight against fate, he will fight against his biological brother. His best friends are the queen who descended from the sky and the doctor who traveled from another world (who said that the one who traveled through time must be the protagonist?). How the cold prince and the doctor with strange ideas help the protagonist resolve the crisis. Watch how a child of the forest transforms into a master of war.