Kim Ji-yeon (Korean: 김지연; born August 19, 1995), better known by her stage name Bona, is a South Korean singer and actress. She is a member of the South Korean-Chinese girl group WJSN, and also its sub-unit WJSN The Black. She made her acting debut in the KBS2 drama Hit the Top (2017), and was cast as the female lead in the teen drama Girls' Generation 1979 (2018). Most recently, Bona gained recognition for her portrayal as world champion and gold medalist fencer Ko Yu-rim in the tvN drama Twenty-Five Twenty-One (2022).