On November 18, 2021, Naver News revealed that Grandline Group (GLG), the newly-established K-Pop sub-label of Grandline Entertainment (GRDL), would be debuting a new girl group on January 5, 2022. The group name is inspired by the word "high-key", and aims for a confident and healthy beauty. Later on November 20, 2021, the group announced their official SNS accounts.
On November 23, Yel was officially announced as the group's first member via a choreography video. On November 26, Seoi was introduced as the group's second member. Three days later, on November 29, Riina, a former Produce 48 contestant and WM Ggumnamu member, was revealed as the third member.
On November 30, Sitala was introduced as the group's fourth member. On December 21, 2021, via the group's SNS it announced with a promotion schedule that they will make their debut with the first single album titled, "Athletic Girl", which was released on January 5, 2022. On May 25, GLG announced Sitala had departed from the group due to personal reasons.
On June 7, a teaser posted on the group's official SNS for their first comeback to be released on July 6, with a new member. Later on June 9, a promotion schedule posted and revealed the title of their first maxi single album, "Run". On June 14, Hwiseo introduced as a new member of the group with teaser photos for their first maxi single.
On December 7, 2022, a scheduler was released for their first mini album, Rose Blossom, set to be released on January 5, 2023. In an interview released on March 13, the group revealed that they were currently recording songs for their upcoming album. On August 1, the group announced their comeback with second mini album, Seoul Dreaming, set to release on August 30.
"Time to Shine" was pre-released on August 23. On January 11, 2024, a teaser was posted for their upcoming digital single "Thinkin' About You", set to be released on January 19. On February 11, a concept poster was posted for their upcoming digital single "Deeper", set to be released on February 15.
However, on February 13, GLG announced that the release will be delayed to a later date. On February 20, the new date was revealed to be February 27. On March 8, it was announced that H1-KEY was appointed as the honorary ambassador for the Korea Employment Agency for Persons with Disabilities.
On March 18, the group released their special single (labeled as special NFT album) "Airplane". On May 27, it was announced that the group will make a comeback on June 19. On May 30, the group released a teaser for their third mini album.
The following day, they released a promotion calendar for Love or Hate. On June 2, 2025, GLG announced that H1-KEY will make a comeback on June 26. The next day, H1-KEY unveiled a series of spoiler images for their fourth mini album, Lovestruck.
On July 18, H1-KEY announced they would be making their debut in Japan with their first-ever Japanese mini album, titled Lovestruck, on August 27. On July 28, it was announced that H1-KEY had signed an exclusive contract with Choi Creative Lab, thus confirming previous speculations of the group's transfer from their previous agency, GLG, to Choi Creative Lab. On December 22, it was announced that H1-KEY will release the digital single "Not Like a Movie" on January 5.
On February 9, they announced that they will be releasing their fifth mini album Lovechapter on March 5.
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