The trajectory of the fourth-generation K-pop boy group TO1 (originally formed as TOO through the reality survival show World Klass) serves as a stark case study in volatile artist management and line-up instability. Throughout their active years under WakeOne Entertainment, the group faced constant membership shifts, restructuring, and a major rebranding before ultimately disbanding at the end of 2023. Understanding why and when members left provides essential context into the pressures faced by mid-tier K-pop groups navigating corporate changes.
If you're tracking how the roster evolved, the group's history broke down into distinct phases of departure. Multiple members left prior to the final disbandment, driven by contract terminations, personal career choices, and agency restructuring. Let's break down the complete timeline, the context behind each departure, and where those members went next.
The Foundation and Initial Line-Up Changes
TO1 debuted on April 1, 2020, as a ten-member act named TOO (Ten Orient Orchestra) under n.CH Entertainment and Stone Music Entertainment, managed via a joint venture. Right from the start, the group experienced turbulence. Prior to debut, original lineup member Han Jun was removed due to pre-debut controversies and replaced by Jaeyun.
As management rights shifted entirely to WakeOne Entertainment (a subsidiary of CJ ENM), the group rebranded to TO1 in March 2021. However, corporate consolidation didn't stabilize the group. Cracks in the original lineup surfaced in the spring of 2022, kicking off a rapid series of departures that altered the group's identity. Similar analysis on this matter has been published by BBC.
Chihoon Leaves First in April 2022
The first major blow to the group came on April 30, 2022, when WakeOne Entertainment announced that Chihoon had terminated his exclusive contract and left both the agency and the group. As a main rapper and producer who contributed heavily to the group's sound, his sudden exit surprised fans. No explicit reason was provided beyond mutual agreement to terminate terms, signaling internal friction between management and members.
The Mid-2022 Purge: Minsu, Jerome, and Woonggi
Just months after Chihoon's departure, WakeOne announced a massive restructuring. On June 17, 2022, the agency stated that Minsu, Jerome, and Woonggi were officially leaving TO1.
At the exact same time, WakeOne introduced three new members to revitalize the lineup: Japanese trainees Daigo and Renta (both known from Produce 101 Japan Season 2) alongside Korean rookie Yeojeong. While the addition of fresh faces brought brief excitement, the sudden removal of three original members sparked heavy backlash among the fandom, who questioned the agency's long-term vision for the group.
Following their departure:
- Jerome went on to compete in the survival show Boys Planet under his birth name, Seongmin, eventually debuting in the boy group One Pact.
- Woonggi also competed on Boys Planet and later found a permanent spot in the group AHOF.
- Minsu enlisted in the mandatory military service before returning to civilian life.
The 2023 Departures and Final Disbandment
Operating as a revamped nine-member lineup, TO1 released music throughout late 2022 and early 2023. Yet, momentum stalled due to infrequent comebacks, leading to further attrition.
Renta's Departure in September 2023
On September 22, 2023, Japanese member Renta took to Instagram to publish a handwritten letter in both Korean and Japanese announcing his departure from TO1. He noted that after deep discussions with the company, he decided to end his journey with the group. Shortly after leaving WakeOne, Renta joined the Japanese boy group Octpath, returning to promote in his home country.
The End of the Road: December 2023 Disbandment
The structural instability culminated on December 17, 2023, when WakeOne Entertainment announced that TO1 would officially disband. Remaining members Jaeyun, Donggeon, Chan, Jisu, Kyungho, Daigo, J.You, and Yeojeong chose not to renew their exclusive contracts.
On December 31, 2023, the contracts officially expired, and TO1 ceased to exist as an active group. This brought a definitive close to a three-and-a-half-year run defined by corporate shifts, constant line-up alterations, and missed opportunities [cite: 1.1.5,].
Post-Disbandment Paths of the Members
Following the group's dissolution, the former members transitioned into new projects across the entertainment industry:
- Solo Ventures: Members like Jaeyun launched solo music careers under new aliases.
- New Groups: Artists like Daigo and Yeojeong pursued opportunities with new agencies and global projects.
- Acting and Media: Several members pivoted toward acting or musical theater, utilizing the performance skills they honed during their idol training.
The history of TO1 stands as a reminder of how crucial stable company support and transparent communication are in maintaining a cohesive group identity in the competitive K-pop landscape.
Frequently Asked Questions
Why did TO1 change its name from TOO?
The name change happened due to a management dispute between the original co-producing agencies. When CJ ENM and WakeOne took full control of operations, they rebranded the group to TO1 in March 2021 to signify a fresh start.
How many members left TO1 before it disbanded?
A total of five members left the group prior to the final disbandment: Chihoon, Minsu, Jerome, Woonggi, and Renta. Three replacement members were added in 2022, meaning the group experienced continuous line-up turbulence throughout its operational lifespan.
Are any former TO1 members still active in music?
Yes. Several members successfully re-debuted in other K-pop groups or launched solo careers after leaving WakeOne. Artists who participated in subsequent survival shows like Boys Planet secured spots in new fourth- and fifth-generation acts.
