I did not enjoy this drama, but I enjoy some parts of it.

let's start with the good:
I love the roomates' relationship,
that kiss between the leads was WOW
the acting is also very good: the FL was super annoying, the bitch (you know who I'm talking about) was hateful, and that is sign of good acting... right? I was moved by some scenes as well
I LOVED the third couple: the cool noona was the best, no over the top, just chill enough. Gil Mok Jin, clean freak, was lovely as well. Their story warmed my heart the most. I love it when awkward people find love.
Cha Min Ho was cute and his character made sense most of the time. I would have noticed and accepted your feelings from episode one!!

the BAD:
watching a "friend" ruining another friend was very PAINFUL...
the second couple was lovely, but I didn't enjoy their story... it didn't make sense to me,why don't they talk to each other?
Watching people misunderstand each other for every episode was PAINFUL as well
the mail couple was pretty boring. I have seen Park Hye Su in Age of Youth, and she is very cute, but she plays very annoying and boring characters, so I can't say I'm a big fan.

I wish I could get back the hours I wasted whatching this drama. Anyway, I'm tired of writing about this. Watch it or not, you have been warned!