This drama was in one word amazing. I started watching because of Gikwang, but I didn't know what to expect because I had never seen any dramas with him in it before. I was scared I would face the same disappointment I had with Hwarang, the show that I started watching because of Taehyung or V of BTS. The story lacked a lot and V's character could've been developed/shown way more. I was scared to face the same situation with Gikwang but luckily this didn't happen. This show got me on the edge of my seat from start till finish. Waiting for new episodes every week was such a pain because these cliffhangers were the worst. The story was really interesting, especially because it takes place at two different times. I was really getting sick of those cliche romcom drama storylines and luckily this drama was so refreshing in comparison! Of course there was some tension between some characters, but it felt very natural and not at all like those unrealistic love at first sight storylines which romantic dramas tend to have. The characters and actors were great. Everyone has their own backstory which you slowly find out about together with the other characters. As I said, I had never seen a drama with Gikwang in it before and I wasn't disappointed in his acting at all. This was also my first time seeing a drama with Yeo Jingoo in it, and I was so impressed by him as well. He's really great actor so I've started watching other dramas and movies with him in it too. I wasn't sure about Kim Kangwoo's character in the beginning but this changed very fast and I think he did such a great job! I won't spoil anything but his and Yeo Jingoo's character made me tear up near the ending. I'm not someone to cry that easily but their acting + the story was so sad which made me emotional as well. In my opinion, feeling connected this much to the characters is something that makes a show great. They also added a sort of ethical layer to the story as in how far you can go in using technology on humans and about taking responsibility. Nowadays people seem to try to avoid suffering as much as they can, but this drama kind of shows the importance of pain and taking responsibility for your actions, even though that might hurt. I don't really have much to say about the music. Not that it was bad, it was completely the opposite, but this drama didn't seem to focus on music that much. I can mainly recall the intense intro and outro music which were great and really suited the drama. Overall this drama was great. The story was really refreshing and the acting was amazing. I was really sad when I found out there were only 12 episodes but the story fitted perfectly. I would recommend this drama to everyone. It's relatively short, has a very interesting plot and a unique way of storytelling with great acting. A must see if you like Korean drama!