I decided to watch this drama merely because it was so popular and I was one of those people who hadn't watched it yet. I expected a lot from it, which was a reason why I was a little bit scared, but it was better than what I thought it would be and I understand why that much people love it.

Story
I like how the drama starts, it catches your eye inmediately and you of course want to keep seeing it, because it shows you something tha will happen 2 months in the future. As I was watching it more things kept appearing, they don't stick to one topic but there are a lot more, although of course they pay special attention to the main one.

Acting / cast
Amazing election for the cast and the acting blew my mind, I mean it. They portrayed really well the emotions and the way of being of their characters. I was specially shocked by Kim So Jeon (Cheon Seo Jin in the drama) because her character had a lot of sides and I think she couldn't have showed them to us in a better way, incredible job.

Rewatch value
I think that all good mistery dramas are worth to rewatch because knowing who did all the things makes you have a different view of the whole story since the beginning and you can pay attention to other details, so yes, in a year (for example) I would watch it again.