BoyNextDoor is a South Korean boy band formed by KOZ Entertainment in 2023. The group consists of six members: Sungho, Riwoo, Jaehyun, Taesan, Leehan, and Woonhak. Characterized by its eponymous 'boy next door' image, the group defines their work as easy listening with a thematic focus on daily life.
BoyNextDoor debuted in May 30, 2023 with the single album Who!, which formed the first installment in the First Love trilogy that defined the group's first releases. The extended play Why.. followed the same year and marked the group's first appearance on the Billboard 200 chart. The group's second EP, How?, became the group's first release to top the Circle Album Chart. The group debuted in Japan later that year through Universal Music Japan with the maxi single "And,".