Watched this drama in 2021, and it didn't live up to the mostly-glowing reviews. Probably due to the fact that there had been other stronger dramas in similar genres since "Bad Guys" aired in 2014. Think "Flower of Evil" and "Stranger".

The writing had plot holes, and tried too hard with being clever with metaphors; it got a bit too much towards the last few episodes. The pacing was a bit draggy at times, for an action drama. The overall acting from the cast was rather flat. They were either brooding or angry/shouting. Such a shame that Park Hae Jin wasn't given a meatier role.