This should be the first K-Drama which successfully give picture of the failure of criminal justice system, since it takes "Criminal Justice - 2008 (UK)" as story structure. Many aspect can be added since the original drama only last for 5 episodes, but again, the director and writer of this drama has failed. The title, "One Ordinary Day", only last for 20 minutes at the first episode, and the rest are dumb anecdotes.
When every character in a drama, looks like they were playing a "drama", then it's a failed drama.
It should be depth in every character, just like the original drama. "One Ordinary Day" has a shallow face.