H1-Key is a South Korean girl group, formed and managed by Grandline Group (GLG) and Sony Music Entertainment Korea, comprising four members: Seoi, Riina, Yel and Hwiseo. The group's pre-debut began with the release of a dance cover video for the Tinashe song "Me So Bad", announcing their debut single-album, Athletic Girl in December, 2021, releasing it on January 5. On May 25, 2022, GLG announced that former member Sitala had left the group due to personal circumstances and on June 7, 2022, H1-Key announced the release of their first maxi single album titled Run, which featured the addition of her replacement, Hwiseo. The album appeared on July 6, 2022, and peaked at number 47 on the Korean chart, earning the group a nomination for Best New Female Artist at the Seoul Music Awards that year. H1-Key released their first extended play titled Rose Blossom on January 5, 2023; the anniversary of their debut, which peaked at number 20 on the Korean chart.
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