I really enjoyed watching all episodes and can't wait for episode 20. The story is unique. Not your typical crime series. It will activate the detective in you, lol. You will find yourself thinking about it after watching each episode. Trying to guess the story behind each situation, reasoning in your mind why did it happened and what could happened. In short, it will blow your mind away! Luckily, I'm that type who wants series like this. If you're planning to watch this, pay attention to every details cause if you don't, you will just get confused like the ones who wrote bad reviews here, lol. If you're the type who's watching while scrolling on your cellphone, forget watching this. This needs your full attention. I even rewind it on some scenes I want to fully understand. This is the only way that you will get to appreciate this kind of series. One last thing, the actors are very great. Lee Seung Gi played with my emotions. You really are a versatile actor. Whatever happens in the ending, I won't regret that I watched this.