BOYNEXTDOOR (Korean: 보이넥스트도어) is a South Korean boy group under KOZ Entertainment, a HYBE Corporation subsidiary led by ZICO. The group is composed of six members: Sungho, Riwoo, Jaehyun, Taesan, Leehan and Woonhak. They debuted on May 30, 2023 with the single album WHO!.

The first track's music video, "But I Like You" (Korean: 돌아버리겠다), was released on May 23, 2023. The second track's music video, "One and Only", was subsequently released on May 26, 2023. The third and final track's music video, "Serenade", was released alongside the single album.

On September 4, 2023, the group released their first extended play, WHY.., consisting of 6 tracks. It included their first three singles "But I Like You", "One and Only" and "Serenade", and the EP's lead single "But Sometimes" (Korean: 뭣 같아). Read more on Last.fm. User-contributed text is available under the Creative Commons By-SA License; additional terms may apply.