I really like it. Sure, I get what people are talking about.
The plot was superficial and something seen before, but this had a way more realistic feel than other similar ones.

The way the actors portrayed their characters and the way the characters themselves behaved (or were written to behave?) was believable.
I mean, if this was possible and happened in real life, I do think the good guys would enjoy the small moments in between the whole saving the world adventure. Things most of the time would not go the way they planned. And they would have to bloody their hands a bit too. The fact that this was slow-paced and happened within a week or two only made this all the more enjoyable, at least for me.

Also loved the fact that there wasn't that much dialogue between a few of the characters.
Seon Hwa (Lee Sung Min), Cheong Seok (Nam Da Reum) & Ae Ran (Kim Yoo Jung)
There were a few plot twist I DID NOT see coming which is rare for someone that has seen as many shows as I have. I'm really glad I stumbled upon this small gem.

If you want to watch action or thriller then maybe save this for another day, but if you're just bored or wish to kick back and relax, then sure, push play and snack on some popcorn.