This dark and moody thriller starts out with a confusing episode that eventually leads way to gritty gangster plot line filled with betrayal and death. Every actor put their all into this, and while the plot became a bit predictable towards the end, I personally think that was because of effective writing rather than bad writing. There are a few really well done surprising plot twists that literally made me yell "wait, what?!" at the screen, which is always a great part of a well done show. I feel like this show feels a little dated, and there were definitely some confusing elements which accounts for my rating.
I just have to throw in that the friendship between Shi Hyun and Soo was one of my favorite parts, especially after seeing them as enemies in "Falling for Innocence." It's always fun seeing two great actors playing enemies in one show and friends in another.
Overall this was a good watch, although not something I would watch again.