South Korean singer who was a part of the K-pop girl group Girls' Generation and who has worked as a presenter and rapper, as well. In Girls' Generation, she is joined by Taeyeon, Yoona, Tiffany, Yuri, Sunny, Seohyun, Hyoyeon and Jessica.
She has also worked as model, a television VJ, and radio DJ.
She and Sunye Min are both members of South Korean girl groups.
She was discovered at age twelve after winning the 2002 Korea-Japan Ultra Idol Duo Audition.
She has one older sister, singer and actress Choi Soo Jin.