Chun Hae-sung (R, front), vice unification minister of South Korea, shakes hands with Jon Jong Su (L, front), vice chairman of the Committee for the Peaceful Reunification of the Fatherland of the Democratic People's Republic of Korea (DPRK), at Peace House, a building in the South Korean side of Panmunjom, Jan. 17, 2018. South Korea and the DPRK have agreed to jointly march at the opening ceremony of the South Korea-hosted Winter Olympics and to cheer together for both athletes of the two Koreas during the Olympic period, Seoul's unification ministry said Wednesday. (Xinhua/South Korean Unification Ministry)