I truly don't understand the high ratings most give to this drama. My best explanation is a phenomenon I've seen repeatedly on this site: If the actor(s) are well-known, popular, and/or beautiful people, it's very likely that a mediocre drama will receive 10's from everyone. (See "My Mister" as an example.)

While this drama did an excellent job of dealing with the topic of mental illness, I was overly distracted by thoughts about how, while everyone is "broken," some people are more broken than others - and especially that they should work on themselves before seeking a romantic relationship. I realize that, in real life, that can't be necessarily avoided; but while this drama ends pretty well, if they did a realistic Season 2, they'd all be divorced and/or one of them would have literally murdered all the others.

Another downer for me was the Americanization of people's morals in this show. While young Koreans may truly be as sexually loose as depicted in this drama, one major reason I think many people escape to Korean dramas is that they are sick and tired of the "You kinda like me? I kinda like you! Let's have sex right now!" American shows. It hasn't worked out well in America, and Korea would be well-advised to retain their conservative Buddhist values which drives the purity found in most dramas (i.e. first kiss halfway through the series).

I'm trying to think what I did like about this drama, but I really hung on too long to watch it to the end. None of the characters were likeable at all, and I couldn't wait for it to end. I can honestly say that I didn't like anything about this drama.