"Volume 9," also known as 10th Anniversary album, is the full-length album Shinhwa. It was released on April 3, 2008 in celebration of the group's 10th debut anniversary. It was first released as a First Press Limited Edition, with 50,000 copies, each with a hologram serial number and a 120-page photobook. The regular edition was released a week later on April 10. "One More Time", a ballad track, was the lead track to be released, as a digital single on March 24, 2008.