Jung Taek-woon (Korean: 정택운; born on November 10, 1990), known professionally as Leo (Korean: 레오), is a South Korean singer, songwriter and musical theatre actor, formerly signed under Jellyfish Entertainment. Leo debuted as a member of the South Korean boy group VIXX in May 2012, and began his acting career in 2014 in the musical 'Full House' as Lee Young-jae. In 2015 he began his songwriting career, and with VIXX member Ravi formed the group's first official sub-unit VIXX LR.