"Happiness is doubled when you share them together, and sadness is halfed when you share them together." —Yoona Im Yoona (born May 30, 1990), better known by her mononym, Yoona, is a South Korean singer and actress. She is a supporting vocalist, main dancer and the visualist in K-pop girl group, Girls' Generation. Yoona was a trainee under SM Entertainment for seven years and two months. As an actress, Yoona is best known for her roles in Love Rain, Prime Minister and I and You Are My Destiny.