I watched this drama because it was on Netflix and Yoon Shi Yoon was starring it. I'm seen him twice already, in Hit the top and as Enrique in Flower Boy next door. I don't know why, but I usually like his acting very much, he reminds me Gong Yoo when he was younger.
Story - the story was ok in the beginning, it seemed a good story, but it was so badly made... The plot had two many twists that it was as Prison Break. Every time something was about to happen, something else terrible for the main leads would happen to avoid to continue the story. When I was in episode 12 I was hoping it would have already finish. Perhaps it would have been ok with 16 episodes, even better with 12.
For the two main leads, I didn't have any problem with the gap age difference, because I know the romance wasn't the most important thing in this show, and even better, cause I couldn't see any chemistry between them. And the ending.... I couldn't understand why they made a 20 hours show to finish the same way as it could have finish in the first episode.
On the other hand, there was no character's development. All the time the characters were manipulated by Chong On, the villain, and they changed sides... So, you never know which twist you were going to see, because they hadn't any coherence at all. One moment they think one thing, the other they do exactly the opposite.
Acting - as I said before, I like Yoon Shi Yoon very much, even if in here he hadn't the funniest rol as he had in others dramas. The rest of the casting was good, overall the villain shaman. So, my 5 is mainly for Yoon Shi Yoon.
Music - I only remember one song that was kind of nice and they repeated all along the episodes, so, apart from that, nothing special to say.
Rewatch value - I only watch twice the dramas that I've really liked, so, no, I'm not watching this again.