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ZEROBASEONE (제로베이스원) is a South Korean Boy Group that debuted in 2023. They consist of 5 members: Sung Hanbin, Kim Jiwoong, Kim Taerae, Park Gunwook and Seok Matthew.

Formed through Mnet's "Boys Planet" and managed by WAKEONE, ZEROBASEONE debuted in July 2023 as a nine-member project group with a predetermined activity period of two and a half years. The group was initially conceived as a temporary configuration, with all members aware from the outset that the lineup would eventually conclude its project term. As that period neared its end, the members agreed to a two-month extension in order to release one final album and hold an encore concert as a full nine-member team. That extension carried the original nine through March 2026, when the project term officially closed.

Rather than disbanding entirely, the group restructured around five members: Sung Hanbin, Kim Jiwoong, Seok Matthew, Kim Taerae, and Park Gunwook; who chose to continue under the ZEROBASEONE name. The remaining four members, Zhang Hao, Ricky, Kim Gyuvin, and Han Yujin, concluded their project contracts and moved on to separate paths, later regrouping under YH Entertainment to form "AND2BLE". The five-member continuation was framed by the agency as a new season built on the trust shared among the members who remained, with the group's identity and shared history treated as something that would persist beyond the original configuration. Sung Hanbin has described the shift as requiring the group to relearn how to present its performance lines with fewer people, while Park Gunwook noted that the reduced lineup allows each member's individual strengths to come through more clearly than the nine-member format did