I loved The Fiery Priest!! Many of the recs already mentioned may have headstrong protag or are action focused shows. However, they don't necessarily have the same action comedy vibe that The Fiery Priest has.
Chief Kim - same writer as The Fiery Priest
Special Labor Investigator Jo
Into the Ring - currently airing
Doctor Prisoner - darker than the others
The Queen of Office - this is also very similar, but I haven't watched this one
History of the Salaryman - this is on my to watch list
