Okay, I am not usually a fan of thrillers when it comes to kdramas but this was INSANE. Literally each episode I was on the edge of my seat and having constant anxiety. This show was crazy. The main couple had great chemistry but wow of course Lee Joon Gi's acting was incredible. His diversity and change of emotions is just remarkable. You really feel like you are watching a true crime story with all the details and background history within the show. The writer did a amazing job, actors was wonderful, plot thickened constantly within each episode. Definitely recommend!!