Kim Jeong Hoon is a South Korean singer and actor. Born on January 20, 1980, he also is known as John Hoon in Japan. He first debuted with the music duo UN in 2000, but after it disbanded in 2005, he focused more on acting. He made his acting debut in the 2004 television drama “Orange.” He has since starred in many popular films and television dramas, including “Goong” (2006), “Her Legend” (2013) and “Immutable Law of First Love” (2015).