Yoo Jae-suk
On May 15, 2020, Lee announced that she had signed a contract with ESteem Entertainment. Through MBC's "Hangout with Yoo", she, under the stage name "Linda G", founded the summer project co-ed trio named SSAK3 with Rain and Yoo Jae-suk. They released a debut single "Beach Again" on July 18, 2020 and officially debuted on July 25 with a debut stage on Music Core. SSAK3 is a special summer project, and they announced that all proceeds from their songs and promotions will be donated to communities in need.