Kim Jeong Hoon - Kim Jeong Hoon (born January 20, 1980), also known in Japan as 'John Hoon', is a South Korean singer and actor. He initially rose to fame as a member of Korean duo UN debuting with the single Voice Mail in 2000. After the duo disbanded in 2005, his fame increased as an actor starring in Goong, a drama based on comic book of the same name.