Now (2001)

Blurb:
Just before the fall of the mighty Korean Kingdom of Goguryeo, a lone man roamed the land, causing destruction beyond imagination. He unleashed Sa Shin Mu, a form of martial arts never before seen in this world.

When peace suddenly returns to the land, it’s said that this warrior was killed by none other than his own younger brother, a mighty warrior, rumored to be the first and only one to have mastered Sa Shin Mu. But in the same manner that Sa Shin Mu suddenly swept though the country, this ultimate warrior and all knowledge of his martial arts suddenly vanishes.

Now, 20 years after the fall of the Goguryeo Kingdom, 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?

Source: www.anisearch.com/manga/3035