Sunny (born May 15, 1989), real name Lee Soon-kyu, is a South Korean singer, radio DJ, music show host and member of the Korean girl group Girls' Generation (Korean: 소녀시대), formed by SM Entertainment in 2007.
Sunny was born in the United States. Soon after her birth, her family moved to Kuwait. However, her family then moved to South Korea because of the Gulf War. Her father was in the college band Hwaljooro with Bae Chul-soo. She is the niece of Lee Soo Man, the founder of SM Entertainment.
In 1998, Sunny entered Starlight Entertainment and became a trainee for 5 years before transferring to Starworld where she became a member of a duet called "Sugar" which never debuted.
In 2007, she was then recommended by the singer Ahyoomee, who transferred to SM Entertainment. After several months of training under SM Entertainment, Sunny debuted as a member of Girls' Generation that same year.