I started this drama with very few expectations. To be honest, with expectations that it was gonna be a lost of time. I have never been a lover of Park Shin Hye, I find her adorable and beautiful but when talking about acting she has always sending me varied experiences, and almost never good ones.
Buttttttt I started it and it really surprised me, in a good way.

Let's start talking about *acting*, I can not say anything bad about the actors, I'm not "bias" for Hyun Bin, but I've always praised his great performance despite some bad scripts and characters; this time, Hyun Bin presents a character with a deep emotional pain, with behaviors of anxiety disorder, the best of this is that we see how the character Yoo Jin-Woo goes from being mentally balanced to an alcoholic with problems to face the reality, a person who has to deal with post-traumatic stress day after day. Although not everything is perfect in this point, because it lacked depth on the part of the writers who easily forgot the problems that the protagonist had shown two episodes ago. Park Shin Hye, showed me a facet of good performances (and good Spanish! What a shock! so great!) A great repertoire of expressions and new ways of relating to their co-stars, was something beautiful, although not perfect as lacked a bit of depth to her character. The other supporting actors were between "fantastic, I love you" and "I do not know what you're doing here and I don't care" the latter is mainly directed to both ex-wives, I dont know what happened there, it was a horror to see their scenes without any meaning but to stole time, it was fatal; although it is also divided the fault with the writing of characters so vague and without depth.

Let's continue talking about the quality of production, I do not know how much Netflix had to do in the production, but I could see within the first 30 minutes of the first episode that it was going to be fantastic. The interactions between the real and the virtual world were impressive, the changes were made as if by magic (the magic of technology). And, most importantly, you could still distinguish the real from the virtual reality, or at least the first chapters, because we, the spectators, also get involved in the same way that the main character Yoo Jin-Woo, without knowing everything transforms and we can not distinguish if what is shown on the screen is reality. I can not but express how great the direction and production is, it is a real delight to see it on the screen.
*Here is the problem*
Writing was what I liked the least, it started very strong, every week I wanted more and more, but after a while the problem lengthened, forgetting the problems raised before for the characters, the non-main characters were vague and without depth, I could not care less what happened to them. There was never a Villain with a capital V, which could be good if it highlighted the demon that had the protagonist inside him, his own battle with himself, but it was not achieved. Here is the weak link of the whole drama, a tremendous pity because it started with great potential that was lost over time.
For all the above, I can say that it is a drama that is worth seeing, it entertains you and it is beautiful when you see it, with great performances and a tremendous direction. While it has its weak points, they are not so tragic when viewed in a casual way. For these reasons I give it an 8 and I am left with my thought, that I already had some time ago, that Hyun Bin is a tremendous actor.