spot. [8] The leader of the group is  Kim Tae-yeon . The other members are  Jessica Jung ,  Sunny ,  Tiffany ,  Kim Hyo-yeon ,  Kwon Yuri ,  Choi Sooyoung ,  Im Yoona  and  Seohyun . Contents    [ hide ]  1   Career 1.1   Pre-Debut 1.2   2007–2008: Debut and