Lee Si-yeon (hangul:???, hanja:???, born Lee Dae-hak, 24 July 1980) is a South Korean transgender actress and model.
In 1999, Lee participated in the Anti-Miss Korea competition.
In 2007, Lee changed gender through surgery and became a woman.
Born Lee Dae-hak (???, ???), she is the niece of Seo Jae-hyok, a famous singer-songwriter and guitar player from South Korea and a member of Buhwal (??)