4MEN is a three member idol group signed to Happyface Entertainment. The group debuted in 1998 and was originally a four member group (thus the name 4MEN), but member Yoon Min Soo left in 2001. But nonetheless, 4MEN has continued to maintain their high popularity and have been together for over ten years. Their powerful long ranged vocals have made 4MEN one of the most renowned KPOP groups in Korea and are deeply respected by many musicians. They are one of the few idol groups that mainly sing ballads.