ss501

SS501 (pronounced as Double-S 501 or Deo Beul E Seu Oh Gong Il) is a South Korean boyband under management of Daesung Entertainment, also known as DSP Entertainment. The first “S” stands for “Super”. The second “S” is an abbreviation for "Star". The number 5,0 and 1 means `five members united as one forever' . Their official fan club is known as "Triple S".SS501 debuted in 8 June 2005 with their first single "경고" ("Warning"), with a second single "Snow Prince" released in late 2005. The group was inactive in Korea for most of 2006, although they had a fan meeting in Japan in April.The hiatus was due to Heo Young Saeng's throat condition which required surgery, thus resulting in a need for time to fully recover.In mid-2006, they held their first concert, "Step Up Concert" in Osaka, Japan. In late 2006, they returned to Korea in order to promote their first full album, which was released on November 10 called S.T.01 now. Singles from the album included "Unlock" and "Four Chance". As well as promoting the album on various variety and music shows, they also filmed a show on MNet called SOS. The group also lent their voices for the 2006 animated movie.
Later in 2007, the group debuted in the Japanese market. A Japanese fan club has been established with the name of "Triple S Japan"; it officially debuted on March 25, 2007, when SS501 had their first official meeting with the group. The group released their Japanese single "Kokoro", alongside multiple versions, including one with all members and five others featuring the members individually. The single debuted at #5 on the Oricon chart, and move to #3 the next day. A full album was released later in the year.
In 2008, SS501 returned to Korea with their single Deja Vu released on March 8 2008. The title track was the first song to be promoted, and they started their comeback on music channel M.Net's M Countdown. After success with their single "Deja Vu", they began to promote their second single, "A Song Calling For You". They performed their Goodbye Stage on Music Bank on June 6, 2008, to return to Japanese activities. On October 2, 2008, an official announcement confirmed Kim Hyun Joong as part of the cast for the Korean version of Hana Yori Dango, also known as Boys Over Flowers, which is was broadcasted via KBS 2TV in the first half of 2009 with a total of 25 episodes. Due to two of the members' busy schedules, Jung Min performing in a Korean production of the musical "Grease" and Hyun Joong filming Boys Over Flowers, SS501's album, originally due for release in late 2008, was pushed back to July 2009. Therefore, a subgroup was formed consisting of the latter 3 members, they released a special project album U R Man under the name of SS501 in November, 2008. The group had a cameo in the fourth episode of Boys Over Flowers as performers in a club, singing "U R Man". Finishing their promotional activities for 'U R Man', they went on to promote '내 머리가 나빠서 ("Because I'm Stupid"), a song they sang for the official soundtrack of 'Boys Over Flowers'. The song was very well-received due to the success of the drama. They won the "Song of the month (Feb)" award at the 32nd Cyworld Digital Music Awards. Hyung Joon and Kyu Jong later released "Lonely Girl" for the “Bad Girl Diary” Official Soundtrack.