Su-Ho Kim
Kim Suho is the main protagonist of Kim Hajin's novel.
His gift, sword saint allows him to cut through anything even concepts and makes him early on one of the best swordsmen in the world. When he enters cube, he is directly rank 1 and keeps that rank during all his cadet’s years.
As you would expect from a cliché main protagonist he is a truly righteous one with a sense of justice and characteristics befitting a hero.