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3piece, formerly known as onair, was a South Korean girl group under SW Entertainment. The group's final lineup consisted of Soo, Viki, and Iya. They debuted on August 5, 2024, with the digital single "Summer Feeling".

The group was first introduced as onair in November 2022 under J-Star Entertainment, with the original lineup consisting of Kimi, Sohyeon, Jihye, and Namkyung. Prior to their Korean debut, they promoted through the ONAIR Live Tour in Japan Start Up from November to December 2022. In January 2023, it was announced that the group had transferred to SW Entertainment and was preparing for its official debut. Throughout 2023 and early 2024, the lineup underwent several changes, with Jihye, Hyeum, and Kimi departing and Yubeen joining the group.

In March 2024, onair officially rebranded as 3piece. Ahead of the group's debut, the members adopted new stage names, with Yubeen becoming Viki, Sohyeon becoming Soo, and Namkyung becoming Iya. Following the release of "Summer Feeling", the group released its second digital single, "Light Up", on October 4, 2024.

In June 2025, member Soo stated during a livestream that the members had not been together for some time and indicated that the group had quietly disbanded. Although SW Entertainment never issued an official announcement regarding the group's status, 3piece is generally regarded as having disbanded in 2025.

출처: kpopping.com