Just before the fall of the mighty Korean Kingdom of Goguryeo, a lone man roamed the lands causing destruction beyond imagine using Sa Shin Mu, a form of martial arts never before seen in this world. Now, 20 years after the fall of the Kingdom of Goguryeo, a new rumor is spreading that a secret manual detailing this legendary martial art has resurfaced. Will Sa Shin Mu once again dictate the fate of this new era?