Sunny (써니) is a Korean-American singer. She is a member of the Korean pop girl group Girls' Generation. She was a radio DJ and hosted the "Reckless Radio" program with Super Junior's lead vocalist Sungmin; taking over after fellow member Sooyoung withdrew from the show. She was a regular cast member on the popular reality television program Invincible Youth and was the only original member to return for Invincible Youth 2. In August 2023, she didn't renew her contract with SM Entertainment.
- Stage Name: Sunny (써니)
- Birth Name: Lee Sunkyu (이순규)
- Nickname: DJ Soon, Sunny Bunny
- Birthdate: May 15, 1989
- Birthplace: Los Angeles, California, United States
- Blood Type: B
- Height: 155cm
- Weight: 44kg
- Religion: Christian
- Education: Baehwa All-Girls High School
- Languages: English (Fluent), Chinese (Basic), Japanese (Basic)
- Family: Uncle Lee Soo Man, founder of SM Entertainment
- Hobbies: Swimming, Video Games, Sports
- Interests: Music, Fashion, reading magazines, dancing, singing & shopping
- SM Entertainment (2007–2023)
- [2013.06.13] Yeowangui Gyosil (OST)
- [2014.11.20] First Kiss: Super Hero Series #3
- [2017.09.15] Jyae Boji Ma (U&I) (with Henry)
- [2008.06.05] Super Junior-Happy - Cooking? Cooking! (#1 Cooking? Cooking!)
- [2008.08.14] Working Mom OST (#2 Sarangeul Mollayo (Wang Ji Ta))
- [2009.03.05] Story of Wine OST (#2 Ijeseoya (Vocal Sunny of Girls' Generation))
- [2009.09.23] Heading to the Ground OST (#1 Sunny, Taeyeon - Sarangingeollyo)
- [2010.03.23] Oh! My Lady OST (#1 Geudae Inhyeong)
- [2012.02.01] Miryo - MIRYO aka JOHONEY (#3 Saranghae Saranghae (feat. Sunny))
- [2012.08.22] To the Beautiful You OST "It's Me" (#1 Sunny & Luna - Naya (It's Me))
- [2021.12.27] 2021 Winter SMTOWN : SMCU EXPRESS (#7 12wolui Insa (Goodbye), #10 Bich (Hope from KWANGYA))
-  Tae Hee, Hye Kyo, Ji Hyun (cameo)
- [2008 - 2009] Live Power Music
- [2009 - 2010] The M
- [2009.10.23 - 2010.06.11] Invincible Youth
- [2011.11.12 - Present] Invincible Youth 2
- [2012 - Present] Music Island
-  Super Junior-Happy - COOKING? COOKING!
- [2012.03.28 - 2012.06.10] Catch Me If You Can - Brenda
- [2008.02.03 - 2008.07.31] Reckless Radio - DJ
- Her favorite colors are yellow and pink.
- Her favorite food is Japanese ramen.
- Her favorite fashion is denim.
- Her motto is "Everyday Sunny Day".