Let me start by saying this, the initial episodes very so well made and has us intrigued about the whole plot. But from that initial intrigue, nothing adds up or makes sense. The drama was so poorly written and the characters have no life to it much to the dismay of the viewers. The characters had so much scope but there was not one character that was well explored and by the end you are left with no idea about what the characters are. The only thing that was good about the show was the amazing cast and the brilliant OST, other than that it was just an average drama. The ending, well i dont even know what happened. Im guessing even the writers lost the plot. Guess the writers somehow tied it all up together. To be honest here, i had no idea what the hell was happening to the show till the finale and after completing it i am left with more questions than answers.

To those who are planning to watch, its better to find something else. There are whole lot of better written shows out there like Stranger / Designated Survivor.
I stayed for Namgoon min and if not for him I would have dropped it at episode 6.