I normally don't go out of my way to write a review for MDL. I've got more K-Dramas to watch. However, I want to save you from falling into this trap.
Let's start with the good stuff: Yuri acts well. She doesn't only look georgous, she actually plays a vital part in the story and conveys genuine looking emotions. Second good thing about this is the story. It's a quite interesting perspective: former agent runs a local bar and keeps hoodlums out of the neighborhood. It's got action, and... action. And some action. The rest... well, let me get to that.

So now on to the rest: the rest of the actors. Much of this is related to the writing, but the actors themselves failed to lift their mediocre (at best) characters to new levels.
Park Si Hoo looks scary. He's a pretty boy and it seems like he knows how to fight, but for the rest... He's unable to show any emotion apart from his smile, which makes him look pretty creepy. Cho Seong Ha is a veteran, but doesn't transcend the level of failed amateur in this K-Drama. His emotions aren't there, his acting is off the wall and transparant. Lee Soo Hyuk should've complained about his character, or protested and stop performing all together. His character is childish, idiotic and stupid.  Yoon Tae Young is the bad guy, butkeeps going back and forth between being the super villain who gives orders to kill people and being scared of some dudes in a suit, almost bawling his eyes out. It's totally unrealistic and beyond believe.
The bad acting starts in episode one and doesn't end untill episode 11. There's a decent episode there and one more with 12 though that's already going back down to earlier levels. And the final 4 are as bad as the rest.

I wanted to talk about the writing, but that would be spoiling. The writing is inconsistent, flawed and beyond believe. I'm not talking about some minor flaws, but major plotholes that destroy any credibility the story had. And it already had none.

Although the music isn't bad, it just doesn't fit. There's a scene where the main lead tells his old flame that he trusts her. Queue romantic, soft ballad. After which he completely devours her face. I'm not even kidding. It's like watching a hungry lion eating the carcas of an antilope which died of a disease while you're listening to some smooth jazz.

I've been extremely underwhelmed with this K-Drama and thought about dropping it multiple times. The reasons why I didn't were Yuri and because I didn't want this to get the honour of being the first K-Drama I dropped.

If you think I'm wrong, watch the first 5 minutes of episode one. That cringy feeling you get there will last you through the entire drama. Trust me, watch something else