1 of 1 is the fifth Korean studio album and the ninth overall by South Korean boy band Shinee. It was released digitally and physically on October 5, 2016, under S.M. Entertainment and distributed by KT Music. The album contains nine songs, including the title track of the same name, "1 of 1". Musically, the album is a modernized twist on the retro genre, and stretches back to the 1980–1990 period. Additionally, based on their '90s theme, the group released a limited edition of cassette tapes alongside the CD version. In order to promote the album, Shinee appeared on several South Korean music programs, such as Music Bank, Show! Music Core, and Inkigayo, where they performed material from the album. On November 15, 2016, Shinee released a repackaged version of their fifth studio album titl