Kisu 기수 Is A South Korean Singer-Songwriter. He's Born On October 2 1990. He Is A Former Member And Vocalist Of The Boy Group 24K and Their Subunit 4K. As A Soloist He Went By The Name Soo. He Made His Solo Debut On December 22 2017 With His First Studio Album Sweet Lie. Kisu Is Also A Finnish Singer That Was Popular In The 70s And The 80s. He Was Born 20 June 1951 Helsinki Uusimaa Finland. His Birth Name Is Kristian Olof Jernström.