In a world with bloody and vast battlefields where several forces fought for supremacy; a young boy only known as number 2044, was kidnapped and trained to be an assassin by the enemy since he was a child. After much intensive training and struggling through life-threatening situations, he gained the name “Mukhyang”. But Mukhyang was never satisfied, he had an unfulfilled thirst for something, and that was the path of the sword! As Mukhyang was dissatisfied with his life as an assassin, he met his mentor 'Yu Baek of the Hwan Sa Sword' and his life changed forever. Will he be able to reach the pinnacle of martial arts?! Fighting with geniuses as he climbs his way to the top!