Choi Yoonyoung (ìµì¤ì) is a South Korean singer and songwriter active in the K-indie and rock/metal scenes. Before beginning his solo career, he was a member of the band Kico and the group Rage Susan, gaining experience as both a performer and songwriter. He made his solo debut on February 28, 2024, with the EP SkyWorld (íëëë¼), marking the start of his individual musical journey. Known for blending indie and rock elements with emotional storytelling, Choi has released singles such as "you and me eternal summer (featuring Jin Hwi Park)" and "Vitamin Water" in 2024, followed by his second EP Sunnyday Express in January 2025.