I'm not really into office/work related dramas, but since I am literally out of options, I decided to give it a try.
One thing that annoys me in many kdramas is the overacting. It's a good thing that this is not one of them. I enjoyed the acting of the main leads. I think they did a great job.
Story wise, I can't say that I didn't like it, but since I am not a fan of this kind of kdramas (as I mentioned above), I can't really say much besides the fact that I found it really "long". Although it's not slow paced, I felt like each episode wouldn't end. I don't regret watching it though.
The one thing that I really didn't like is the mixing of the sound and the sound quality. The music is too loud and in many scenes it's hard to listen to the actors. This is why I gave only 6 stars. It was extremely annoying for me. It must be the worst mixing I've heard in a drama or a movie.