927 A.D. The Killer-Blade Army has toppled the ruling dynasty, plunging the kingdom into chaos. The only remaining heir, Prince Jung-Hyun (Lee Seo Jin) is living in exile, unaware of his family's dark fate. Still loyal to the dynasty, the beautiful and deadly warrior Soha (Yoon Soy) sets out to find Jung-Hyun and guide him to become the great leader he was born to be. But with the Army's greatest assassins and the criminal underworld hunting them, Soha and Jung-Hyun are swept into an explosive, nonstop battle of swords, wits and bloodshed as they fight to reclaim the fallen throne.