I finished watching this drama a few hours ago.
It's one of the best, if not the best, korean dramas I've seen so far.
Before watching it I wasn't sure whether I would've liked it or not as the plot didn't really convince me, but now I am sure I would've regret it if I didn't pick it up, this drama is a must watch.
I usually watch crime/police dramas since these are my favorite genres but I love when there's even a tiny bit of romance, since it makes the drama more pleasant to watch.
This drama has a lot of romance but it's well-developed throughtout the story and I'm sure it wouldn't bother those who don't like romance, since it doesn't ruin or cover the crime/police part.
I LOVED how friendships are developed and how strong they are: I found myself being happy when two or more characters made up or when they had a party.
There are a lot of emotional scenes and touching themes, you will drop some (or a lot) of tears, either of joy or sadness, so make sure to keep some tissues near (I rarely cry but one of the episodes made me cry).
The OST is amazing and it makes those emotional scenes, that are already great by themselves, even better.
The characters are well-developed, especially Sang Soo (best character imo, props to Lee Kwang Soo for his acting).
I gave a 10/10 to "Rewatch Value" as I would probably love it as much as I did the first time.
Another thing I appreciated is the ending: I often found myself disappointed or not fully satisfied by how dramas end, since some of them have cliffhangers or don't answer all the questions, but this is not the case as everything is clear.
There would be a lot more to say about this drama but I think this is enough to get a grasp of it.
I hope you're going to watch it (if you haven't already) after reading this review.