The mighty Kingdom of Goguryeo is in the midst of a war which has raged on for decades. In need of talented warriors to help lead their people, O’Rhang Yhun is sent on a mission by his master into enemy territory to find and bring back his eldest brother.

However, just as O’Rhang departs on his mission, his master, a renown warrior and general, passes away. Since O’Rhang's 2nd eldest brother has always been jealous of his martial arts potential, he betrays O’Rhang by branding him as a traitor defecting to the enemy. With his master dead, he has no one powerful enough to defend his honor. He is pursued and nearly killed.

O’Rhang had barely managed to escape from his homeland when a maiden as beautiful and graceful as an angel saves his life.

Join O’Rhang Yhun in this action-packed, adventure-love story to uncover the secret behind the martial arts his master passed onto him (Sa Shin Mu), his quest to find his oldest brother, and the score he has to settle with his 2nd eldest brother!