少女時代 (Shōjo Jidai), known as Girls' Generation in South Korea, is an eight-member South Korean girl group formed by SM Entertainment in 2007. The group consists of: 윤아 (Yoona), 티파니 (Tiffany), 유리 (Yuri), 효연 (Hyoyeon), 수영 (Sooyoung). 서현 (Seohyun), 태연 (Taeyeon), and 써니 (Sunny). Former member 제시카 (Jessica) left the group in 2014. They made their debut in Japan on June 11, 2011. The group began a foray