I don't know if it was coincidence or these actors choose a great movie all the time but when I see a movie with Hwang Jungmin, who played Jeong Chang, or Choi Minshik, chief Kang, I automatically know that it's going to be a good movie.
I didn't like Lee Jungjae at times when he was trying to correctly pronounce each syllable, but he played the role superbly.
As for the story-line and how the conclusion of the movie unfolds, wow. I was lost in words. The same feeling I got when I watched Shiri about 13 years ago.
"When everyone turned their back on me, he called me a brother."
Awesome, Awesome, Awesome. No other word can better describe how the movie is.