- Brilliant story and equally awesome storytelling (until last couple of episodes, where I think the creators were confused on how much to carry onto season 2, where the son that old antagonist would probably the main antagonist for s02). They also kept the main plot reveal mysterious enough to not get boring well throughout the first half of the season.


- Rushed ending almost ruined the whole series, almost seemed to be as if last 2 episodes were written and directed by someone else. Almost everything (in last 2 episodes) was predictable and cliche'd. Maybe they wanted 18 or 20 episodes to hash out everything.


- The worst and I mean the worst acting I have seen so far in kdramas by the main lead (Lee jong suk). I mean is he so popular in korea that he received such an awesome role despite his expressionless, stone-faced, always-looking-like-a-lost-one-in-the-room so-called acting skills? His dialogue delivery was so tame and lame that it looked like a little kid throwing mumbling tantrums in an intense scene (actually in all scenes). He definitely has a talent to bring down the intense or heavy scene the director must be trying to present. It must be so embarrassing and at the same time infuriating for the other cast members to be giving their all and yet the main lead is doing his worst possible in return. I have not seen many korean shows, but, of all the ones i have watched their are so many male leads who can easily pull off the necessary vibe needed in this role. It's like a rich kid showing up and reading lines after reading just a single time and everyone one probably cheering him as the best actor. I almost dropped this show after the pilot episode because of this main lead. if he's getting such brilliant roles, out qualifying other actors, then in my opinion he must have tons of connections/cash, or maybe casting team must be taking a break after casting pretty good rest of the cast and hence got high on god knows what and cast this guy as the main lead, or maybe the magic do exists in this world and this guy has it and casts it on the production team to get the role. Because, I honestly do not understand how else can someone who acts like this can land such a role.

This Lee jong suk broke me from korean shows with his worst acting skills (is it right to even call it a skill if you are so bad at it?), i am definitely going to take a break from kdramas.

Overall, this show is a must watch. Good thriller. I would have rated this one an overall 9, but, Lee jong suk's acting is a given negative 2 (if not 4). I feel for Kim Joo Heon & Yang Kyung Won, for they gave such good performances.