Kim Hyun Joo's acting was #MAGNIFICENT, I hope she win a Baeksang for this. At first you would really find her character gullible because that's how the character is and she made people believe who's watching the show that she is that kind of person. It's the same when you're mad at villains. She acted it very well, I love how her character progress through out the show. I love how this show was written which is based on "Trolley Problem". It would really made you feel the dilemma of decision making. I love the ending since it was emotionally and morally satisfying. This is now one of my favorite show.