On December 23, 2024, Moai Entertainment updated their website by adding IWU as part of their roster of talents. IWU's SNS accounts were opened on the same day. They simultaneously revealed the first three members via TikTok which were Chaerin and Sulhee of the duo 1CHU and newcomer Shion.
According to the CEO of Moai Entertainment, the final lineup would consist of 4 or 5 members and they would be debuting in May 2025. It has also been clarified that the group is independent from 1CHU. Sometime in January 2025, IWU changed their group logo.
However, on January 30, a new group under Moai Entertainment named E11iVyn opened their official TikTok account, simultaneously introducing their members with IWU's Chaerin and Shion, as well as newcomers Youngeun and Juha. In February 2025, it was noticed that IWU's TikTok account as well as posts from their Instagram account have been deleted. Their Twitter account remained inactive.
IWU's artist page on the official website of Moai Entertainment has been taken down with E11iVyn's replacing it. On February 3, E11iVyn members opened their individual TikTok profiles. A few days later on February 6, the agency announced that Chaerin would still be handling 1CHU's activities as a solo act while preparing for a group debut, following Sulhee's departure from Moai Entertainment and subsequently 1CHU, Puzzle and IWU.
The Instagram account of IWU has appeared to have been changed into E11iVyn's, further confirming the group's rebrand. On February 8, they updated their group logo. On February 9, Moai Entertainment posted behind the scenes content of the E11iVyn doing a photoshoot, teasing that Lu Yuting had joined the lineup.
A few days later on February 11, E11iVyn posted a group photo affirming the five-member lineup. On March 19, E11iVyn posted a version of their lineup reveal where Lu Yuting has been edited out, suggesting her departure from the group. Content where she was present had also been deleted from their SNS accounts.
On March 27, through an interview with Dizzo, E11iVyn is confirmed to have a four-member lineup and would be debuting sometime in the first half of 2025 with a concept that is a mix of sexy and girl crush. In July, fans noticed that all Instagram posts of E11iVyn have been archived. The group has also changed their Instagram bio to "2025 New K-Pop girl group debut coming soon".
On July 17, E11iVyn released their profile photo revealing Juha left the group and Yekang was added to the lineup. On October 2, 2025, the group announced at the Gyeyang Residents' Day Autumn Concert that they will debut on November 11. Later on October 21, it was announced that E11iVyn will be debuting with the song "Orbit" off of their first digital single "Red Line" on October 30, 2025.
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