When young Hahyeon Shin’s mother sacrifices herself to give him a chance to escape the family she married into, he finds himself alone in a hostile world. His only goal is to find his mother’s family, the House of Namgung, and train in martial arts to avenge her and become a protector of the innocent. But when he is tested by the Namgung family, they discover that he is a martial arts genius with a perfect physique and the potential to become the greatest martial artist who ever lived.