Yoon Bo-mi was born in Suwon, Gyeonggi, South Korea on August 13, 1993. She has one older sister, Yoon Sun-mi, and a younger brother, Yoon Jong-jin. She was trained in the martial art of Taekwondo from the age of five and is a holder of a third degree black belt. She attended Youngshin Girls High School and later on, Korean Arts High School; from where she graduated in February 2012. While studying, she decided to put off college to concentrate on music.