Liked:
1) Lee Jung Eun as Im Sun made this show for me. I've always loved her as an actor, but wow, she totally shone in this role! Her comedic timing is brilliant and she's very good at physical comedy. She was strong when needed, and vulnerable when necessary. If I WERE to watch it again, I'd probably just watch the scenes with her in it.
2) The Im Sun/Ko Won relationship. I loved it. I appreciated that the writers showed a little bit of what is required of an idol, and I liked how he learned her secret early on. Their scenes were wonderful, and I liked how they showed him most with Im Sun rather than Mi Jin.
3) Choi Jin Hyuk. Always.
4) Mi Jin's best friend. I loved her supportiveness, and they had some emotional scenes together.
5) Mi Jin's parents. At times they were irritatingly over the top, but in the end, I enjoyed watching them. Lee Hak Chan as Mi Jin's father, this may sound strange, but I love his face.
6) The mystery and the red herrings. I was surprised by the culprit, and that doesn't often happen.
7) The OST, especially Jung Eun Ji's Stay. She has a hauntingly beautiful singing voice.

Not so much:
1) Jung Eun Ji as Lee Mi Jin. Her pursed lip talking got on my nerves. Was she trying to be cute? Pitiful?
2) The relationship between Mi Jin's best friend and the ML's office mate. He was WAY too old for her!
3) The lack of romance. Literally the last few minutes of the last episode. I'll include lack of chemistry between leads. I couldn't even root for them to get together; I just wanted the show to be over by that time.
4) The styling. ML - all I could focus on was his ridiculously pointy sideburns. 2FL - terrible haircut, possibly achieved by using hedge trimmers. Mi Jin's mom - her red lipstick was absolutely caked on.
5) The female prosecutor served no purpose.
6) WAY too many flashbacks! The show could have been shortened if they'd left most of them out.

So, all in all, I enjoyed it. It's a fun watch if you want some laughs, but just look for too much romance.