I really enjoyed this drama!
The plot was really interesting, form time to time a little predictable, but not all the time. The suspense was good and the actions scenes were really cute.
Relationship between the main characters was funny and warm. The drama part was strong and stable. There are a few questions that you will ask yourself while watching. It can even trigger a discussion.
I was waiting to see Jang Seung Jo with big role like this, and i enjoyed it. I recommend the drama with two hands.