JYP娛樂
Sunye was born on August 12, 1989, in Seoul. She attended Korea Arts High School and Dongguk University. In 2001, Sunye was discovered by JYP Entertainment during Park Jin-young's "99% Challenge" project, where she sang and danced. She then trained at JYP Entertainment until she debuted in the Wonder Girls in 2007. Sun was one of the longest serving trainees at JYP Entertainment, along with Jo Kwon of 2AM and Min of miss A.