One word to explain the first episode - Explosive
They've packed so much into it, keeping the viewers intrigued for the future episodes.
The comedy is pretty enjoyable and the plot has a lot to offer. Considering it's a 12 episode drama and not 16 episodes, it's safe to assume that the story itself will have a lot substance.
My worry going into it was just how 'bad' and 'crazy' would the characters be? Plenty actually. I despise the male lead who is actually pretty 'bad' and K's character is actually crazy. Oh Gyeongtae is a good cop through and through and honestly a ray of sunlight and humanity in the midst of our other characters. Though our female cop played by Han Jieun got only about a minute of screen time, I can't wait to see how she's going to be incorporated into the story.
My only critique would be that the editing is wacky in a few scenes, but other than that the first episode is pretty damn good and I can only be hopeful for the future ones.