BOYNEXTDOOR is a South Korean boy band formed by KOZ Entertainment in 2023. The group features six members: Sungho, Riwoo, Jaehyun, Taesan, Leehan, and Woonhak. Known for their relatable "boy next door" concept, they create easy-listening music inspired by everyday experiences. They debuted in May 2023 with the single album Who, launching their "First Love" trilogy. Their first EP Why followed the same year, earning them a spot on the Billboard 200. In 2024, their second EP How topped the Circle Album Chart. BOYNEXTDOOR made their Japanese debut with the single And and continued their international presence with the EP 19.99. The group held their first tour, Knock On Vol 1, at the end of 2024, and released their first digital single If I Say I Love You in early 2025. Their fourth EP, No Genre, released in May 2025, achieved commercial success.