BtoB 4U

BtoB 4U is the second subunit of the South Korean boy group BtoB, formed in 2020. The subunit consists of four members: Eunkwang, Minhyuk, Changsub, and Peniel. The "4U" in the name represents "For You," signifying that the subunit was formed to provide entertainment and music for their fans (Melody) while the other members, Sungjae and Hyunsik, were fulfilling their mandatory military service.

BtoB 4U debuted on November 16, 2020, with their first mini-album, "Inside," featuring the title track "Show Your Love." The subunit was created not only to fill the void of the absent members but also to showcase a different musical style and performance dynamic compared to the full group. Their sound typically incorporates elements of pop, R&B, and ballad, highlighting the vocal abilities of the members.

The formation and activities of BtoB 4U were intended as a temporary measure to ensure BtoB continued to release music and connect with fans during the members' military service. With the return of all BtoB members from their military duties, the subunit's independent activities have largely ceased, though the name remains as a recognizable part of BtoB's history and discography.