pros: I just watched this drama by chance and didn't put too much thoughts in it. I really liked the story from the very beginning, this drama is easy to dive in. I loved that so many things were feeling odd and that in the end you get to understand why that is. and everything makes sens. I loved that the story evolves while you are watching it, and things that happened in 1987 aren't the same anymore.
I feel like I could eventually rewatch the show because the story is very tricky, I certainly missed some things. and also, knowing the truth, it can be very interesting to watch the scenes with new eyes.

cons: I didn't feel hooked and managed to watch a couple of episodes a day. it didn't matter as I liked the story anyway. I wasn't convinced by the love story. the two characters had no chemistry for me. they could have been very good friends for example and the story would have felt better. I had a clue about the perpetrator, but it was surprised anyway.
as fun as it was, I didn't score more than 7 because I know I will forget it easily. for me it's a good show, but not a priority.

when to watch: even if it isn't the main event, there is a lot of violence (harsh feelings, harsh words, and physical violence), I wouldn't recommend for under 18.
watch with friends on week-ends, it's also a good show to help relax yourself after work.
it's a solid 7, so have fun!