Apparently, North Korea was interested in talking about aid. South Korea was interested in talking about missiles.
North Korea then issued a rather unhappy statement:
"The South side will pay a price before the nation for causing the collapse of the ministerial talks and bringing a collapse of North-South relations that is unforeseeable now,” the North Koreans said in a statement before leaving for the airport, a day before the meeting was due to end.
There are some people whose "reasoning" may prove, as has been written, "baffling".