Oh, so this is what pissed the North Koreans off.

Speaking at the International Democrat Union last Friday, Park said this:

In a luncheon meeting with the party leaders, President Park Geun-hye said North Korea’s pursuit of nuclear weapons had resulted in the country’s isolation and dire human rights conditions.

“Now the North Korean people are faced with hunger and a tragic humanitarian situation as the North sticks to the path of… isolation by developing nuclear arms,” Park said during the luncheon at the presidential office Cheong Wa Dae.

“I request consistent attention and support from IDU members as international support and cooperation are vital for improving the North Korean situation and bringing about unification of the two Koreas,” she said. [Yonhap]

So that explains that.