4Men (Korean: 포맨) is a South Korean rhythm and blues group formed in 1998. The group consists of three members: Haeun, Joseph, Hanbin.

Vibe (Korean: 바이브) is a South Korean R&B group consisting of singers Yoon Min-soo and Ryu Jae-hyun. They debuted in 2002 as a trio with rapper Yoo Sung-gyu, who left the group after the release of their second album. Vibe has released eight studio albums, and numerous hit songs including "Love Me Once Again", "Long Long Time", "While Looking at the Picture", "That Man, That Woman", “Drinking,” and "Come Back to Me".