I would like to start off the review by saying that this is one of the most unique mystery/thriller kdramas I've ever watched. The entire concept was very unique. This drama is definitely not for everyone because the plot is very complex and they purposefully leave you confused until the last few episodes; However, it's very fun to try to breakdown the plot with theories as a viewer and it's extremely satisfying when you start getting answers to your questions. I feel like the people who dropped this drama did so because they probably got confused by the complex storyline but they failed to realize that that's the whole point of the plot being so complex. This drama is a must watch because the plot is sooooo unpredictable and every episode ends with a bang, which I LOVEDDD. I have to say that this drama had one of the most satisfying endings I've ever seen in a kdrama because every character got the end that they deserved and the entire drama was an emotional ride. The message shown through this drama is so strong and well done. The acting was amazing as well.