As they are the most recent million album selling group in South Korea, they are often referred to as 'the Nation's idol', and considered 'Legends of K-Pop' with other first generation idols H.O.T. and SES, etc.
The group debuted with the single "어머님께" ("To Mother"). After winning the Grand Prix Prizes from the all three major broadcasting centers in Korea for their multi-million selling 4th album, they began a "100-day Human Concert" where all 100 shows were sold out and each day had a different theme.
The five members also appeared in a Korean TV series on MBC, called "Baby Diary", in which they acted as a family to take care of a little baby boy. Every one of them had a duty (i.e. Son Ho Young acted as 'mommy' and Park Joon Hyung as 'daddy'). The TV series was huge success and widely popular.
In 2004, one of the members Yoon Kye Sang left the group, and the remaining members continued group activities, but they discontinued the group activities after their 7th album in 2005.
Since then each member had been persuading their solo careers as a singer and actors. Son Ho Young started his solo artist career in 2006, with ranked No. 1 on music charts, and Kim Tae Woo also started a successful solo artist career.