On February 11, 2010 Ga-yoon was featured on the soundtrack for "The Woman Who Still Wants to Marry", singing a duet with Han Ye-ji in the song "One Two Three".
11 февраля 2010 года Гаюн записывала саундтрек к сериалу The Woman Who Still Wants to Marry в дуэте с Han Ye-ji исполняя песню "One Two Three".