Updated to add every justifiable type-in that quiz takers have suggested below (Korean romanisation is a lot more complicated than I'd imagined...!) I've redone the map and modernised the layout (slightly). Thank you everyone for playing!
Can you accept province name ended with -buk for those start with North and ended with -nam for those start with South? I tried Gyeongsangnam (for South Gyeongsang) but doesn't work.
Can I ask for alternative spellings. In my classes we've spoken about Cholla for North/South Jeolla. I'm no great student of Korea, so couldn't think how else to spell it. Nice quiz though.
Shame it is not featured!
This converter can help http://roman.cs.pusan.ac.kr/input_eng.aspx