You would think this drama gets boring after a couple of episodes because we see the same bus drive and explosion over and over again, instead every new loop brings the MLs new information and they slowly unravel how to stop the loop.
It never gets boring, there are so many great twists, I was on the edge of my seat the whole time.
Even though this is a fast paced plot driven drama we really get to know some of the characters and their backstory too, which really helped to make them more three dimensional and actually made me pretty emotional a couple of times.
The acting is excellent, especially of the police officer and the mother.
What I loved so so much, was that no stupid decisions were made by the MLs just for plot reasons. Both MLs are really smart regular people that have common sense (which a lot of dramas are lacking sadly). There are no clichés, no cheesy romance, just a bonding of two people who go through insanely traumatic events over and over again.
I wasn't aware of any plot holes which is great too, some things are implied and not explained! (like the reason for the loop)
The script of this drama was simply perfect, thrilling, exciting and one of the best of the genre I'm sure.
I really hope we will see more c-dramas like this!