[Teaser] YOON HYUN SANG(윤현상) _ When would it be(언제쯤이면) (Duet. IU(아이유))

Artist : YOON HYUN SANG(윤현상)
Title : When would it be(언제쯤이면) (Duet. IU(아이유))
Release: 2014.10. 30