Beaming shortwave broadcasts into the North was the idea of Kim Sung-min, a former North Korean military propaganda writer.

NPR: N. Korean Defectors Fight Regime with the Radio

The comments came after Afghan officials found the body of Shim Sung-min, 29, a former information technology worker who was volunteering with the South Korean church group on an aid mission to Afghanistan.

NPR: Afghan Kidnappers Kill Another S. Korean Hostage

"We could barely sleep while waiting for the results of the summit meeting, as we were full of such high hope and expectations that the release and safe return of our family members abducted there is up to the meeting of two leaders, " said Cha Sung-min, a spokesman for relatives of the hostages, at their Saemmul Community Church in Bundang, south of Seoul.

NPR: Taliban Renew Threat Against South Koreans