When I started watching this drama albeit with a bit of skepticism towards the already overused time travel plots, it did surprise me with a thought-provoking storyline and amazing acting by almost all the characters in a consistent manner. There was no sudden shift of characters' essence for driving the plot rather a smooth transition of screenplay enhancing the entire experience of watching the show.
I would certainly recommend this to people who are interested in criminal procedural dramas with a pinch of science fiction and a lot of food for thought. The main role going through the constant struggle of facing the reality (?) of his situation makes the audience more empathetic towards his cause. The question of how to return to his original timeline (?) and not being able to give in to his feelings towards the female lead... all make for good character development. The group dynamic is emphasized quite a bit and improves over the course of various investigations carried out.
Background music is another crucial part of this show. It is serene, smooth and flows with nostalgia. All-in-all this was a pleasant surprise to me. Thumbs up for all associated with this show.