Lots of action where the male lead is fighting for what they think is right. They're both supposed to be nice people because one is a priest and the other is just a labor inspector but both aren't scared to fight for justice (fight meaning literally beat people up).
First of all, it's in the same series and therefore has the same concept. Reply 1994 was just as big as 1988 in Korea when it first came out. It's hilarious and has the love triangle that is present in all three Reply dramas.