Really excellent mystery/crime drama. I love that I couldn't figure out who the 'culprit' was until the writers were ready for the audience to be sure. That doesn't happen often. The acting is superb, especially the lead actor. I can't figure out why Ok Tacyeon isn't a bigger name in K-dramas. Even in something light like "Bring It On, Ghost", he was magnetic. It's no different here. I felt so sorry for him as the show went on--it was just blow after blow for him. The bad guys are seriously bad in this one, and there aren't many good guys. I thoroughly enjoyed this show, from beginning to end.