H1-Key (/haɪ-kiː/; Korean: 하이키; RR: Haiki; read as High-key, stylized as H1-KEY) is a South Korean girl group formed and managed by Grandline Group (GLG) and Sony Music Entertainment Korea. The group is composed of four members: Seoi, Riina, Hwiseo and Yel. Sitala left the group on May 25, 2022, and Hwiseo was introduced as a new member on June 14, 2022.