This is an excellent, clever drama!

The plot is a typical spy/romance story but the twists and turns kept me hooked right up to the end. There are parts where I just thought... "What the heck just happened?"

The actors did a very good job, especially the handsome and talented Lee Jun Ki, the only reason why I started watching this drama in the first place; he really did an excellent job here.

The music varied from rap to classic, and an essential part of the drama.

Rewatch value is also 10 because after I finished watching this drama the first time, I said to myself, "that was excellent!" and felt the need to watch it again immediately, in case I was wrong, i wasn't!