Later in 2007, the group debuted in the Japanese market. A Japanese fan club has been established with the name of "Triple S Japan". The group released their Japanese single "Kokoro", alongside multiple versions, including one with all members and five others featuring the members individually. 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 released their official second Japanese album on May 13, 2009 titled All My Love and had a promotional tour in Japan in support of the album. The group also released their Solo Collection, consisting of the individual members' songs.
After concentrating on their individual activities, the group made a comeback and released their second mini album titled Rebirth, with the limited edition being released on October 20, 2009 and the normal edition on 22 October.
Source: Wikipedia.org



















