First of all I've got to confess that I am not really experienced in writing rewievs but reading not so pleasant reviews about this drama I felt a need to justificate it just a little bit.
The story itself is not top notch and I would not anticipate thrilling action or brilliant back story (it wasn't that bad though) from it but the strenght of this drama lies somwhere else. I strongly believe that the characters are what makes this drama unique and special. Have you ever watched a drama or a movie where you totally didn't get motivation beyond character's decisions? In this drama all the characters are given proper psychological background and you got to see their own struggles and the reason beyond their actions. There is also no stereotypicall villain and you you can not fully hate anyone (trust me irritation over female lead will pass) what's more you can see great character development.
Moving on to social anxiety topic I think that is another highlight of this drama and makes wievers reflect on few things. It coused me physical pain to watch how lonely and missunderstoodwas Hwang Ki was despite his trully warm and carrying personality. Placing the action in PR agency helped a lot to emphasize this issue in an interesting and creative way.
Lastly I would like to adress a bit touchy subject which was mix of sweet comedy with tragedy in the background. I personaly enjoyed quite a bit the comedy side. Hwang Ki and the rest of Silent Monster crew were just hilarious and adorable at the same time. Transitions between melodrama and comedy were subtle but I didn't have a problem with that so I guess it depends from a wiever if she or he would enjoy it.
About the music: typicall drama OST it was ok but not great.
Overall I think that the drama despite being not for everyone is still rather underrated. I think that people who are looking for complex characters, are interested in sociall anxiety topic or want a drama with refreshing male lead would enjoy it quite a bit.