I marathoned this awesome drama. I really loved it, the cast and the interesting plot. Definitely rewatchable and recommended. I gave it a 9.5. I also loved the ending of each episode with the funny music video.
It started off really well, but after episode 30 this drama went downhill filled with absolute nonsensical misunderstandings, irrelevant mischieve and annoying neck-breaking events. Do yourself a favor and do not watch this because you will be so disappointed since it started so well.