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1CHU is a South Korean solo act under MOAI Entertainment. They were the first sub-unit of HeyGirls and debuted with the digital single “Oasis” on July 21, 2022. They are also part of the project girl group PUZZLE. They became an independent group after HeyGirls disbanded on December 26, 2023. With Sulhee leaving the group on February 6, 2025, the duo became a solo act with Chaerin as the only member left.