This is probably the most predictable KDrama i have ever watched.Definetely it won't win any award for its originality.
But i had so much fun watching it and at the end this is all that matters.

Cons:
A very basic story and plot.Predictable as hell.We are 10 steps ahead of it and can tell how the story will go on at any time.No suspense and thrilling moments.
Flat and one-dimension characters,lacking depth.Not so much of a character development either.
Familiar faces playing familiar characters,the villains in this case.Once you see them you already know they play scummy chars.No surprises.

Pros:
Nice,upbeat and catchy songs.Gives a cheer-up vibe,liked it.
Smooth direction and cinematography.
Good and natural acting.
Is only 12 episodes.
Familiar faces,as a plus.Know what to expect from their performances.
Bad-ass Female characters,in their own way.Always nice to see strong, independent women.
A well balanced Drama between Action and Comedy.
Many fighting scenes and even more funny moments.
Enjoyable and entertaining.
Great chemistry.The team was hilarious.Has many sweet and touching moments too.
Predictable, yes.But Holy Sh*t that twist in the final episode was really wow.I didn't see that coming.Credits for that.

As i always say, first check the Genres and the Tags.
When we see the words Prosecutors,Law,Corruption etc,most likely we expect a very heavy Drama.
"Bad Prosecutor" is not one of those.Is light,funny and easy to watch.
Grab a bucket of Popcorn and have a nice Weekend!