Sunny

Sunny was born on May 15, 1989 in Los Angeles, California, and moved to Kuwait while she was still an infant. Her family moved to South Korea around the time of the Gulf War. She shares the same birthday with her two older sisters (Lee Eun-kyu and Lee Jin-kyu). She speaks fluent Korean. 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. One of her older sisters was the manager for Sugar, but when the group disbanded, she became active in other parts of the music industry.

Sunny has contributed to a couple of soundtracks as a solo artist, singing the theme song "You Don't Know About Love" for the SBS drama Working Mom, "Finally Now" for IPTV's Story of Wine and "Your Doll" for the SBS's Oh! My Lady. She featured on the Heading to the Ground soundtrack, singing a duet with Taeyeon in the song SarangInGulYo and another song titled Motion performed with the vocal line of the group. She participated in the S.E.O.U.L. song project along with Super Junior's Kyuhyun, Leeteuk, Ryeowook, Sungmin, Siwon, Donghae and fellow group members Seohyun, Sooyoung, Jessica and Taeyeon. Sunny featured in Brown Eyed Girls's Miryo's track "I Love You, I Love You" from her first solo mini album, Miryo A.K.A JoHoney . She also sang a duet with fellow labelmate Luna from f(x) in a song for the To The Beautiful You OST.