On December 24, 2021, FC ENM announced that former Girls Planet 999 contestants Hayase Hana, Lee Yunji, Chang Ching, and Kishida Ririka, would be debuting in the agency's upcoming six-member girl group in the first half of 2022. On January 5, 2022, FC ENM confirmed the group will make their debut sometime in March 2022 and will be called ILY:1. The group's SNS accounts and logo were also revealed later than same day at 6PM KST.
On January 10, 2022, Nayu and Lee Yunji, the latter now going under the stage name Ara, were revealed as the group's first and second members, respectively. The next day, Ririka and Hana were revealed as the group's third and fourth members, respectively. On January 12, Chang Ching and Elva, the former now going under the stage name Rona, were revealed as the group's fifth and sixth members, respectively.
On January 14, it was announced that ILY:1 would release a pre-debut reality show titled ILY:0. The first episode was released on February 4, 2022 at 10PM KST through their YouTube channel. On February 26, 2022, it was announced that the group would be debuting on March 15 with their first single album, "Love in Bloom".
However, on March 11, it was announced that the group's debut would be postponed to mid-April due to COVID-19. On March 18, a teaser photo was posted which revealed that the album would be released on April 4. On June 13, they officially announced that they would be returning with new music on July 19.
On June 24, a scheduler was posted which revealed that the group would be releasing their second single album titled "Que Sera Sera". On December 15, 2022, it was announced that the group would be releasing their first mini album in January 2023. A day later, a scheduler posted on the group's SNS revealed their first mini album titled A Dream Of ILY:1, set to release on January 5, 2023.
On December 20, it was revealed that a pre-release single, "Thanks To... ", would be released on December 25, 2022. On June 14, News1 reported that ILY:1 would be having a comeback at the end of July.
On June 26, a teaser was posted on the group's SNS revealed their second mini album titled New Chapter, set to be released on July 25. On September 22, it was announced that ILY:1 would be having a comeback in late October. On October 3, a coming soon teaser was posted on the group's SNS revealed their first digital single titled "To My Boyfriend", scheduled for release on October 24.
On March 22, 2024, it was announced that ILY:1 would be releasing a digital single in April to celebrate their second debut anniversary. On March 25, they released a teaser for "IMMM", scheduled for April 4. This single would later be included in their upcoming mini album.
On July 18, FC ENM announced that ILY:1 would be having a comeback in August. On July 22, they released a teaser for their third mini album Illang:Firework, set for release on August 20. On November 9, FC ENM announced that Ara had sustained an injury during practice and that ILY:1 would promote as five until she recovers.
On June 24, 2025, the group was speculated to be disbanding after reports of most FC ENM staff leaving the company. FC ENM released a message from the members saying that they were going back to their daily lives after their final concert in Japan, seemingly annoucing the conclusion of the group's activities. However a few hours later, FC ENM released a new statement clarifying that ILY:1 would be continuing group activities without disbandment or suspension, and that the members were planning to "greet fans with a better appearance".
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