I started this drama with zero expectations, but what I found was a hidden gem, everything from the story to the acting to the cast is just perfect. I clicked right away with my taste and I started to get fond of the characters more and more.
Since it's 13 episodes I was worried if the general theme would be squeezed till the end but somewhat in the middle the story became like a different drama and all the action + the thrill was unexpected. I liked that they changed the rhythm so it won't get boring.