Rarely do you find comedic pieces that have all good elements to it. Chief Kim was an amazing drama and it was much different from heavy and romantic dramas.

Story: I personally found the story very interesting, I was never really bored and each plot twist seemed believable and new.
Cast: The casting here was absolutely phenomenal. I had seen a video on youtube where the main leads had been practicing their personas for a very long time in order to perfect it and show it naturally. This really paid off as all the characters were believable and real through the acting.
Music: I still have the ending ost stuck in my head, it's so catchy and fun addition to the show.
Rewatch: Chief Kim is always ready to bring you laughs and its always fun to rewatch.

Overall: I think this is one of the best kdramas out there. Its story is amazing, the casting is amazing and you can guarantee that you can always laugh, get immersed in the story and have a good time.