You can see the other reviews so I'll just say it briefly.

The plot made me sleepy and it is all over the place that I don't know what's the goal.

Nam Joo Hyuk I will always love you (and Lee Sung Kyung) and your acting career but this one is a big NO for your role. :( Doesn't fit. Shin Se Kyung, your acting here is a bit meh. Sorry. Krystal and Gong Myung are much better acting in this drama.

The music though is good to listen and there is one song that I like. 

I dropped this already after episode 12 because it didn't excite me and is really boring D: