A naive yet passionate Sang-hwan becomes a downtown policeman to help the good and punish the bad. But when it comes to gang crime, he is nothing but a coward. One day he gets discovered by a martial arts master and his training to unleash the true power within him begins. Meanwhile, the Ultimate Evil, Black Cloud, is set loose. Now Sang-hwan, who possesses the absolute power, becomes ‘ the one’ who must save the world.