The supreme leader of North Korea and also the younger brother of Kim Jong- chul is the chairman for which party?
Kim Jong-chul:  His younger brother is Kim Jong-un, now the leader of North Korea. Kim Jong-un: Kim Jong-un (Chosŏn'gŭl: 김정은 ; ] or ] ] ; born 8 January 1982–84 or 5 July 1984) is the Chairman of the Workers' Party of Korea (WPK) and supreme leader of North Korea.
Workers' Party of Korea