Have now finished this as the last 2 episodes were shown late night some time this week.
It made me think of the Sopranos, not the storyline, but the being sucked into the lives of people and forgetting that they live by violence and terror.
I think it is really well made and hints at the way outsiders never really understand the culture they think they can just fit in to and take advantage of to suit themselves.
Its good that never of the 2 main european characters aren't portrayed as being perfect.
And its clear that how it finished was in the hope that a second series would be made (IMO).
So would recommend it, and although early on it didn't seem to have that much violence certainly the later episodes do.
Now I am off to google as I dont understand (blush) what the issue is for Koreans living in Japan. (I thought the senior female editor at the paper was really good.)