Moon Seo-yoon to Debut in New Mixed Gender Group 'All Day Project'

Moon Seo-yoon (문서윤), the 23-year-old daughter of Shinsegae Chairman Jung Yoo-kyung and granddaughter of Shinsegae Group's General Chairman Lee Myung-hee, is set to make her debut as a member of the new mixed-gender idol group 'All Day Project'. According to the announcement made by the record label The Black Label on June 9, Moon will join the group, which is scheduled to debut on June 23. Instead of using her real name, she will perform under the stage name 'Annie' alongside fellow members Tarzan, Bailey, Woo-chan, and Young-seo.

Rumors about her debut began circulating last year when photos believed to be from her trainee days with the girl group 'MIAO' surfaced online. MIAO had debuted in September 2024. The Black Label, founded by Teddy, a former producer at YG Entertainment known for his work with BLACKPINK, has officially launched the social media accounts for 'All Day Project', sharing an introductory video and member photos. The video includes a message stating, 'The world may not know All Day Project yet, but we are ready.' Moon's sister, Moon Seo-jin (문서진), also shared the news of her sister's debut on her personal social media.