Haeri is the leader of P.O.P. Her older sister is former Brave Girls member Yujin. She is a former CUBE trainee and trained with the members of CLC. Before joining CUBE, she was a LOEN trainee. She is friends with Blackpink's Jennie, Melody Day's Chahee and Hashtag's Dajeong. She auditioned for "Idolmaster Korea"