Her parents are Choi Woon-yong and Yoon Gil-ja, and she has one older brother. Choi graduated from Busan Sooyoung Elementary, Sooyoung Girl's Jr. High, and Dukmoon Girl's High School, and majored in aerobics at Pusan Woman's Professional College's Dance Department. She enrolled in Hanyang University's Department of Theater/Film Studies. Although Choi completed her first year, she had to withdraw from college studies due to her hectic work schedule.
In February 2014, Choi signed with the talent agency YG Entertainment.