Well, ignoring the some technical aspects..
Overall the comedy was well placed and hilarious..
The chemistry between Father Kim and Detectives/Part Time Workers were spot on..
Every side character played a key role, their acting was also good, except the Lady Prosecutor.
Even through some people might find her character funny, she was overacting too much and annoying.
Felt like this would have been good if it was compressed into a 14 or 16 episode series instead of 20.
The plot was dragged on for too long.