JK is the alias of at least 7 artists: 1) JK - Jeon Jeongguk (전정국) is also known by his stage name Jungkook (정국) or Golden Maknae (due to his exceptional number of talents). He is the youngest member of South-Korean Kpop group BTS (방탄소년단) He serves as the group's main vocalist, lead dancer, and sub rapper. 2) JK's vocalist's real name is Marta Simlat. The name of JK was chosen by chance. 'We were looking for something short, easy to say and something that was catchy. JK it's easy for people to remember' explains Marta.