Im Yoon-a ( æ -- å ' , born May 30 , 1990 ) , commonly known as YoonA ( ì ì ) , is a South Korean singer , dancer , actress and model . Im Yoon-Ah ( ; Hanja : æ -- æ 1\/2 å ; also spelled Lim Yun-Ah ; born May 30 , 1990 ) , commonly known as YoonA , is a South Korean pop singer , dancer , actress , model and spokesmodel .