* Birth name: Kim Taeyeon 태연
* Date of birth: March 9, 1989 (1989-03-09) (age 20)
* Discovery: 2004 8th Annual Best Contest (Best Singer 1st Place & Grand Award)
* School(s): Jeonju High School
* Experience: Solo "If" , Hong Gil Dong OST and "Can you Hear me" , Beethoven Virus OST
* Position : Main Vocalist, Leader
* Birth name: Jessica Jung
* Date of birth: April 18, 1989 (1989-04-18) (age 20)
* Discovery: 2000 SM Casting System
* School(s): Korea Kent Foreign School
* Position : Lead Vocalist
* Stage name: Sunny (Hangul: 써니)
* Birth name: Lee Sunkyu (Hangul: 이순규; Hanja: 李順圭)
* Date of birth: May 15, 1989 (1989-05-15) (age 20)
* Discovery: 2007 SM Casting System
* School(s): Baehwa All-Girls High School
* Position : Sub Vocalist
* Stage name: Tiffany (Hangul: 티파니)
* Birth name: Stephaine Hwang; Hwang Miyoung (Hangul: 황미영; Hanja: 黄美英)
* Date of birth: August 1, 1989 (1989-08-01) (age 20)
* Discovery: 2004 Casting System (Los Angeles, California)
* School(s): Korea Kent Foreign School
* Position : Lead Vocalist
* Stage name: Hyoyeon (Hangul: 효연; Hanja: 孝淵)
* Birth name: Kim Hyoyeon (Hangul: 김효연; Hanja: 金孝妍)
* Date of birth: September 22, 1989 (1989-09-22) (age 20)
* Discovery: 2000 SM Casting System
* School(s): Studied in Beijing, China for Mandarin Chinese
* Position : Main dancer
* Birth name: Kwon Yuri (Hangul: 권유리; Hanja: 權侑莉)
* Date of birth: December 5, 1989 (1989-12-05) (age 20)
* Discovery: 2001 SM 1st Annual Youth Best Contest
* School(s): NeungGok High School
* Position : Lead Dancer
* Experience:
o Appeared in KM Super Junior Show The King's Boyfriend (2005)
o Featured in TVXQ's "Beautiful Life" music video
o Featured in commercials for Choco Pie, Dongil Highvill, and Hot Choco Mite
o Acted in Attack on the Pin-Up Boys
o Starred in MBC sitcom Unstoppable Marriage
* Birth name: Choi Sooyoung (Hangul: 최수영; Hanja: 崔秀英)
* Date of birth: February 10, 1990 (1990-02-10) (age 19)
* Casted: 2002 Korea-Japan Ultra Idol Duo Audition
* School(s): Jungshin All-Girls High School
* Position : Sub vocalist and sub dancer
* Experience:
o Debuted in Japan in the duo Route 0 (2002)
o Featured in commercials for Samsung Anycall
o Modelled for Japan Chubbygang and Skoolooks
o Starred in MBC sitcom Unstoppable Marriage
o Starrred in the film Pure Manhwa — Happily Ever After
* Birth name: Im Yoon Ah (Hangul: 임윤아; Hanja: 林允兒)
* Date of birth: May 30, 1990 (1990-05-30) (age 19)
* Discovery: 2002 SM Saturday Open Casting Audition
* School(s): Daeyoung High School
* Position : Lead Dancer
* Awards/Recognitions
o 2008 Korean Drama Festival: Netizen Popularity Award (You Are My Destiny)
o 2008 KBS Drama Awards: Best New Actress Award (You Are My Destiny)[10]
o 2008 KBS Drama Awards: Netizen Award
* Experience:
o Featured in music videos for TVXQ's "Magic Castle, The Grace's "열정 (My Everything)", Super Junior's "U" and "Marry U", Lee Seung Chul's "Propose"
o Featured in commercials for Sanyo Eneloop, Teun Teun English, Elite, Sunkist Lemondae, Clean & Clear, Sola VitaminC, YeJiMiIn
o Starred in MBC dramas 9 Hits, 2 Outs and Park Jung Geum, and KBS drama You Are My Destiny
* Stage name: SeoHyun (Hangul: 서현; Hanja: 徐玄)
* Birth name: Seo Joohyun (Hangul: 서주현; Hanja: 徐珠賢)
* Date of birth: June 28, 1991 (1991-06-28) (age 18)
* Discovery: 2003 SM Casting System
* School(s): Daeyoung High School
* Position : Lead vocalist
* Experience:
o 2004 SMART Uniform Model
