This is my first time watching Ji Chang Wook's drama and I have become his fan.  This drama has a lot to offer. From action, love, thrill and dramatic scenes. I would say this is one of the best Korean drama that I had watched and I don't mind watching it again and again. Nevertheless, I find the pace of the drama starts kind of slow in the beginning and after half of the series, it started to gain some momentum. I think because the momentum was slow in the beginning, it became to fast to digest at the end. I think It's better to start the climax earlier and make the ending stronger and powerful.  In addition, I think the drama lack mystery part. Maybe it is better if the audience also involved in guessing what happened in the past which can make it more interesting, like the way I Hear Your Voice. This may be can add the suspense more. Overall it was a great journey. I love the couple. They are really really cute together. There are also a lot of romantic and cute scenes that will make you melt.