Boats! Helicopters! Kias! Double Agents! Buttkickery! And of course, Siwon. I really enjoyed this drama. Others have said the pace was slow, but I thought it moved pretty well. Really liked the story and the teamwork that was built as the group of six worked toward solving the mystery. I liked that it tied up in 16 episodes. Honestly, most dramas could be told in 16 episodes or less. (See also: "Gaksital" - 28 long episodes.) there were some good fight scenes, and I liked that the lead female role could hold her own in a fight. She was so-so as a female lead. As others have noted, she made a few really bad decisions, that in a real life scenario, would have been untenable. In addition to Siwon, I really liked Lee Sung Jae as Kwon, Kim Jun Bae as Deuk Soo, and Han Jung Soo as Min Hyuk (Han also played the Death Angel in "The Moon That Embraces The Sun"). This drama is heavy on action, good guys vs. bad guys and spy vs. spy; and light on romance. A good choice if you're trying to get your husband or boyfriend to watch k-drama with you (as long as he's not in the military or law enforcement, then he'll see all the huge no-no's in the story!).