Jung Taek-woon, better known by his stage name Leo, 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.