The story is very interesting, but in my opinion it could've been developed in a better way. The writing isn't very good. At the beginning of every episodes we have to watch, sometimes even for 10min, the ending of the previous episode with additional details. In my opinion, it feels like wasted time and I got easily bored because of this.
Also, they added a twist (new important information) at the last episode which could've been added in previous episodes and been developed more.
Also the OST are not very memorable, nothing special there. And I personally hated very much the OST which is played every time we see the killer...
At the end, I only kept watching because of the excellent acting of the main characters, hoping it would get better later...

So, should you watch it? If you like the actors, please watch it, but don't expect too much from the story.