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On November 1, 2021, FAINIT Company introduced Yumin as a member of their upcoming girl group FAINIT through a group dance cover. They debuted on June 13, 2022 with their first single album "Killer". On September 22, 2022, it was revealed by a friend of one of the members that FAINIT has disbanded in less than a month after the group has gone inactive since July 8.

On January 4, 2023, former FAINIT member Liha posted an Instagram story showing her, alongside fellow members Seoa and Meanu in Chrome Entertainment's practice room, hinting that they have joined the agency in late 2022.