Kim Hyun Jung (김현정), popularly known as Seola, debuted as the lead vocalist of the girl group Cosmic Girls (WJSN), in 2016, under Starship and Yehua Entertainment. Prior to debuting, Seola trained for 10 years and even appeared on Boyfriend's music video of Janus.
In August 2016, Seola, with members Exy, Soobin, Eunseo, Cheng Xiao, Yeoreum, and Dayoung, collaborated with label mates Monsta X to create the sub unit Y-Teen. In May 2018, she along with members of both WJSN and Weki Meki Yoojeong, Luda and Doyeong, formed WJMK, and in June, released the single 'Strong'.
She deubted as an actress in 2017, with the short web-series 'Good Morning Double-Decker Bus' that was used to promote Gyeonggido Tourism. She continued her acting career with leading roles in the kdramas, 'In-Out Sider', 'Goedam', and 'Love in a Black Hole'.
On May 12, 2021, she debuted as a member of WJSN's second sub-unit, WJSN THE BLACK, with the single album "My Attitude".