Where should I start? 1. STORY : Okay, so before it even started to air, based on the trailers I could guess what the story will be about and I was right. A police officer has his daughter kidnapped by a bad guy A, but when he catches the bad guy A he actually discovers....it's a good guy B. Are they brothers? No, they can't be. The story is perfectly made, that it always entertains you. With each episode, you get closer and closer to the cause of the whole chaos. I really applaud the writer, because u can't see such dramas just anywhere. The plot is really unique and with unique twists. 2. ACTING : I knew that this drama would be dope thanks to Yang Se Jong who I encountered first in The romantic doctor Kim ....and I was right. In this drama Se Jong played 3 characters and everytime I saw them, I had feeling that they are different people. To achieve such feeling in other person, it's very hard thing to do! I never saw other actors jobs so I can't really say whether they were bad before or not, but in this drama EVERY character showed emotions, as if it was a real story and not just acting. Everyone started to LIVE their role for real and that's how this masterpiece was created. 3. MUSIC : Since it's action/sci-fi drama, u don't get much of the OST but there is one song which I fell in love and it's the ''Nightmare''. Currently it's the most played song on my Playlist, so I really recommend it! 4. REWATCH VALUE : I don't really rewatch dramas, but I think this could be rewatched (?) Look, in romantic dramas people rewatch it to see the romance and cheesy dates of main couple, but in crime dramas it's a bit hard cause the audience already KNOWS what will happen next, so it's not as thrilling as the first time. 5. OVERALL : Amazing and unique plot, fantastic acting, good music, the plot-twists are the real killers