I'm a vegetarian and I'm fully against animal violence, but,...
SOMEBODY PLEASE GET RID OF THAT DEER
(just take him to a national reservation or sth)
otherwise the drama was great, loved it

it seems this has to have at least 500 characters, so let's do it...
I really liked the story, it was original and the creators were not afraid to deal with some topics, that are quite controversial. It was fun but also realistic, the drama really showed that 'it's okay to not be okay', and that's what I really appreciated. Both Seo Yea-ji and Kim Soo-hyun were PERFECT, no complaints at all. The others were great too, but these two, especially Yea-ji were just born for their roles. Oh Jung-se was irreplaceable too. Jang Young-nam was a big surprise, didn't expect it at all.
I don't have much more to say, only because it was so good that I don't know how to describe it. Maybe just one tiny complaint: I've seen Moon Gang-tae cry way too many times, they made him suffer too much, it breaks my heart. Apart from those parts, I could watch it over and over again.

I had only one problem with this drama: THAT DAMN DEER (and Moon Gang-tae crying)