Sunshine Policy
In May 2017 Moon Jae-in was elected President of South Korea with a promise to return to the Sunshine Policy. In his New Year address for 2018, North Korean leader Kim Jong-un proposed sending a delegation to the upcoming Winter Olympics in South Korea. The Seoul–Pyongyang hotline was reopened after almost two years. At the Winter Olympics, North and South Korea marched together in the opening ceremony and fielded a united women's ice hockey team. As well as the athletes, North Korea sent an unprecedented high-level delegation, headed by Kim Yo-jong, sister of Kim Jong-un, and President Kim Yong-nam, and including performers like the Samjiyon Orchestra. The delegation passed on an invitation to President Moon to visit North Korea. On 1 April, South Korean K-pop stars performed a concert in Pyongyang entitled "Spring is Coming", which was attended by Kim Jong-un and his wife. 
On 27 April, a summit took place between Moon and Kim in the South Korean side of the Joint Security Area. The summit ended with both countries pledging to work towards complete denuclearization of the Korean Peninsula. They also vowed to declare an official end to the Korean War within a year. As part of the Panmunjom Declaration which was signed by leaders of both countries, both sides also called for the end of longstanding military activities in the region of the Korean border and a reunification of Korea. Also, the leaders agreed to work together to connect and modernise their railways.
Workers' Party of Korea
The WPK is organized according to the Monolithic Ideological System and the Great Leader, a system and theory conceived by Kim Yong-ju and Kim Jong-il. The highest body of the WPK is formally the Congress, but in practice a Congress occurs infrequently. Between 1980 and 2016, there were no congresses held. Although the WPK is organizationally similar to communist parties, in practice it is far less institutionalized and informal politics plays a larger role than usual. Institutions such as the Central Committee, the Executive Policy Bureau, the Central Military Commission (CMC), the Politburo and the Politburo's Presidium have much less power than that formally bestowed on them by the party's charter, which is little more than a nominal document. Kim Jong-un is the current WPK leader, serving as Chairman and CMC chairman.