Chung Eui-yong (C), South Korean President Moon Jae-in's top national security adviser, attends a press briefing in Seoul, South Korea, on Sept. 6, 2018. Chung said the two Koreas agreed to hold the third Moon-Kim summit in the Democratic People's Republic of Korea (DPRK)'s capital city on Sept. 18-20. (Xinhua/Newsis)