I've just finished the series and I must say that it is really good!! I loved it!!

First of all, the cast is amazing. The duo Lee Dong Wook/Wi Ha Joon is absolutely amazing and hilarious. The serious but corrupted Ryu Su Yeol and the crazy K show us so many incredible and funny scenes. The supporting cast also deserves a round of applause, be it Ryu Su Yeol's team (with Hui Gyeom, Gyeong Tae and Jae Seon) but also the villains that I wanted to punch in the face more than once, especially Do Yu Gon, Captain Kim and Jeon Yu No. I also have to congratulate the female lead, Hui Gyeom, who was one of the rare female characters that I liked (okay, maybe it was because she didn't have that much screen time and there was only a little romance in the whole series, which I prefer, but still!).

The plot was actually very good and interesting. There are a lot of scenes for which you get frustrated because the villains have the upper hand but it's usually resolved quickly after. The thing that I didn't like with the plot was that there are two stories. We start with a good plot about drugs dealing and corruption but, once this storyline has been resolved, there's a complete turn over and the plot gets to another completely different storyline. And even though it's linked to the main character (or characters, I should say), we don't see the villains that were introduced at the beginning of the story anymore and they just kind of disappeared from the main plot, which is a shame because we spent more than 8 episodes to get used to them.

Anyway, that's the only thing which I was disappointed with (even though, the two plots were interesting enough for me to keep watching). I would say it's a very good series to watch and watch again but the second time would probably be less interesting as there would be no surprises anymore.