The Nine Sword Sects have controlled martial arts for hundreds of years. Lu Yuan, the son of a drug slave, is riddled with poison in his body and is looked down upon by everyone, but he has a pair of eyes that can see through the "vital gate" of weapons. He took three outlaws who had been abandoned by the world and built a monument in the mountains with ordinary iron - what was engraved on the monument was not martial arts, but a path that everyone could take.
