SS501 is a South Korean boy band consisting of five members: Kim Hyun-joong, Heo Young-saeng, Kim Kyu-jong, Park Jung-min and Kim Hyung-jun.[1] They debuted in 2005 with the EP Warning, which included their first number one song, "Never Again".

In 2007, SS501 entered the Japanese market with the maxi single Kokoro, which debuted at number five on the Oricon chart. The following year, in 2008, they became the first South Korean artists to win the award for Best New Artist at the Japan Gold Disc Awards.

SS501 has released one studio album and seven EPs in Korean, and two studio albums and three EPs in Japanese. The group has been inactive since 2010, however the sub-group Double S 301, composed of members Heo Young-saeng, Kim Kyu-jong and Kim Hyung-jun, continues to release music.