Moon Seo-yoon’s K-Pop Debut with AllDay Project

On June 23, 2025, Moon Seo-yoon, the eldest daughter of Shinsegae Group President Chung Yoo-kyung, will make her highly anticipated debut in a new co-ed K-Pop group called **AllDay Project**. Managed by **The Black Label** and produced by industry heavyweight **Teddy**, AllDay Project represents the latest strategic expansion of YG Entertainment’s sister label into the co-ed idol market.

 

## Group Profile: AllDay Project

Label: The Black Label

Producer: Teddy

Debut Date: June 23, 2025

Members:

- **Moon Seo-yoon** (Leader)

- **Youngseo** (Ex-member of Illit)

- **Woochan** (Former BigHit Entertainment trainee)

- **Bailey** (Professional dancer)

- **Tarzzan** (Model)

 

AllDay Project’s lineup blends diverse backgrounds—from underground dance circuits and high-fashion modeling to elite trainee systems—bringing together varied skill sets that promise a fresh dynamic in today’s saturated K-Pop scene.

 

## Member Backgrounds

 

### 1. Moon Seo-yoon

Moon Seo-yoon steps into the spotlight carrying significant public interest as the daughter of one of South Korea's most prominent business families. Despite initially expressing reluctance about her family name overshadowing her artistry, she has completed a rigorous multi-year training program within The Black Label. According to insiders, Seo-yoon has honed her vocal and dance skills privately under Teddy’s direct mentorship, positioning her both as a charismatic leader and a versatile performer.

 

### 2. Youngseo

Formerly known by her stage name in the underground idol group Illit, Youngseo brings established performance experience and a dedicated fanbase from her previous group activities. Her participation in independent showcases and SM Rookies–style pre-debut events has earned her a reputation for strong stage presence and technical dance proficiency.

 

### 3. Woochan

Woochan trained under BigHit Entertainment—now HYBE—where he specialized in vocal stability and rap composition. Though he ultimately did not debut with HYBE’s main roster, his time in that intensive environment equipped him with robust songwriting fundamentals and on-stage confidence.

 

### 4. Bailey

A professional dancer who has toured with major acts in South Korea’s thriving live performance circuit, Bailey is expected to anchor AllDay Project’s choreography. Her deep understanding of hip-hop, jazz, and contemporary dance styles will likely shape the group’s performance identity, emphasizing powerful formations and synchronized group work.

 

### 5. Tarzzan

Tarzzan’s modeling career in Seoul and international fashion weeks contributes a visual edge to AllDay Project’s concept photos and music video aesthetics. His experience in front of the camera adds a visual storytelling dimension that aligns closely with Teddy’s cinematic production style.

 

## Production and Musical Direction

Teddy, the renowned producer behind Blackpink’s chart-topping hits, is leading AllDay Project’s musical direction. Known for his signature blend of EDM drops, urban beat structures, and memorable melodic hooks, Teddy’s involvement signals an ambitious sonic approach:

 

- **Expected Sound:** A fusion of trap-pop rhythms, syncopated percussion, and sweeping synth lines.

- **Conceptual Themes:** Youthful ambition, self-empowerment, and the redefinition of co-ed group dynamics.

- **Visual Strategy:** High-fashion and streetwear-infused styling, leveraging The Black Label’s strong branding partnerships.

 

No direct quotes have been released from Moon Seo-yoon or Teddy as of press time, but promotional materials shared by The Black Label hint at a sophisticated “day-to-night” narrative concept—mirroring the group name AllDay Project—showcasing the members’ versatility from bright, energetic choreography to sleek, nocturnal visuals.

 

## Market Positioning and Industry Impact

AllDay Project’s debut arrives at a time when the co-ed idol format is comparatively rare, offering a unique selling point:

 

- **Co-Ed Appeal:** Allows for dynamic vocal pairings, varied choreographic interactions, and storylines that differ from single-gender groups.

- **Label Support:** Backed by YG Entertainment’s parent company through The Black Label, the group benefits from substantial production budgets, global marketing channels, and cross-collaboration opportunities.

- **Brand Synergy:** Moon Seo-yoon’s high-profile family background is likely to generate media buzz and cross-industry partnerships, ranging from fashion to luxury retail.

 

Analysts predict that if AllDay Project’s pre-release singles and teasers maintain strong streaming numbers, the group could quickly break into Billboard’s World Digital Song Sales chart, following precedents set by Teddy-produced acts.

 

## Looking Ahead: Promotional Activities

In the lead-up to their debut, AllDay Project is scheduled to:

- Release a series of concept photosets and teaser videos weekly starting June 10, 2025.

- Hold a debut showcase in Seoul on June 23 with global livestream availability.

- Appear on major K-Pop variety and music programs, including M! Countdown and Music Bank, during the second half of 2025.

- Launch an interactive fan engagement platform featuring virtual meet-and-greets and behind-the-scenes content.

 

## Conclusion

AllDay Project’s launch marks a significant moment in K-Pop, blending heavyweight production pedigree with a co-ed format that challenges traditional idol archetypes. Moon Seo-yoon’s transition from business heir to front-line idol under Teddy’s guidance illustrates a carefully curated strategy by The Black Label to diversify its roster and capture both domestic and international audiences. As the group prepares to shine on global stages, fans and industry watchers alike will be keen to measure how AllDay Project’s distinctive composition and ambitious concept translate into chart success and cultural impact.