H1-KEY is a four-member girl group consisting of SEOI, RIINA, HWISEO, and YEL, under the management of GLG.

The team name H1-KEY, inspired by the slang 'high-key,' embodying the concept of bold and healthy beauty. The identity of H1-KEY transcends superficial external beauty, focusing instead on inner beauty and strength. This positive message is echoed in their commitment to always resonate with good music.

H1-KEY's first mini-album [Rose Blossom], released on January 5, 2023, achieved significant success both in Korea and globally with its title track 'Rose Blossom.' Despite not entering the charts immediately upon release, the song gradually gained popularity, eventually reaching number one on the Bugs chart and creating a buzz as a 'miracle of a small agency.' The song ranked high on yearly streaming charts in 2023, placing 16th on Genie Music and 37th on Melon, and also achieved notable success in China, ranking third on QQ Music's K-pop chart and being listed among the most popular K-pop albums of the first quarter of 2023 on Wangyi Music.

In January 2024, H1-KEY announced the launch of their new project 'H1-KEYnote.' This project, a blend of 'H1-KEY' and 'Keynote,' originates from the group's identity of 'good music.' Focusing on stories unique to H1-KEY, they plan to release songs encompassing various forms of messages.