This show is great and one of the more original Korean dramas.
I watched it on drama fever where it is called the Joseon Gunman btw.
The story is about revenge. The best swordsman in Joseon gets killed while on a mission for the king to catch a mysterious masked gunman who uses a Western style rifle. He is the victim of a broader conspiracy and after he is killed, the kind declares him a traitor. His son is then sentenced to death and his daughter is sold into slavery. The son (who is the star of the show) runs away to Japan for a few years and comes back as the best gunman ever.
Once back in Joseon, he pretends to be a Japanese businessman while he hunts for the people who killed his dad. He helps poor people n stuff while he searches and becomes a masked hero gunman of sorts.
There is tons of action and drama although the main story doesn't really start until episode 4 so give it a chance. I recommend it to anyone who doesn't mind subtitles.
