SS501

SS501 (currently promoting as Five O One) is a South Korean boy band that was formed under the management of DSP Media. The group debuted on June 8, 2005, with five members: Kim Hyun-joong, Heo Young-saeng, Kim Kyu-jong, Park Jung-min and Kim Hyung-jun. They debuted in 2005 with the EPWarning, which included their first number one song, "Never Again". In 2007, SS501 entered the Japanese market with the maxi singleKokoro, 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 two studio albums and seven EPs in Korean, and two studio albums and three EPs in Japanese.

In 2010, all five members of the group left DSP Media to pursue solo careers, though leader Kim Hyunjoong confirmed they would not be disbanding. After 14 years of inactivity, Kim Hyun-joong, Heo Young-saeng and Kim Kyu-jong reunited for their 20th anniversary as Five O One.