1 of 1 On September 4, 2016, Shinee held their fifth solo concert, titled
Shinee World V, in
Seoul, South Korea. Four of the 34 songs that were performed were songs from the group's new album: "Prism", "Feel Good", "Don't Let Me Go" and "So Amazing". The album was originally intended to be released in the middle of September, but member
Onew sustained an injury while performing during the group's concert and the album release was delayed. On September 27, 2016, the group's management agency,
SM Entertainment, announced that the new album titled
1 of 1 would be released on October 5, 2016, and introduced a new Instagram account created for the group's activities. It was the group's first domestic studio album in over a year, after the release of
Odd on May 18, 2015. Additionally, to align with their '90s theme, the group also released limited edition cassette tapes alongside the CD version. Originally, only one thousand copies were produced for sale, but due to high demand more copies were put into production. SM Entertainment printed a limited 50,000 copies of the album in cassette format. From September 28, 2016 to October 2, 2016, the group released several teasers through their Instagram account. Each member of the group introduced one song of their choice in a segment called "Shinee's Pick - What do you think of this song?" in a promotional radio notice inspired by the '90s along with each photo, which are previews of songs from the new album. On October 1, the group performed two new songs from the album, "Prism" and "Feel Good", at the Spectrum Dance Music Festival. On October 4, Shinee performed the title track "1 of 1" publicly on stage during their showcase for the album at the SM Town Coex Artium. The music video was revealed during the same event. Onew was unable to participate in the dance sequences due to his injury, but confirmed he was receiving treatment and was almost completely recovered. On October 6, the group began their promotions for the title song "1 of 1" on music shows, starting with
Mnet's
M! Countdown KBS2's
Music Bank As part of the promotion, the group members also guested on several variety shows including
Happy Together 3,
Weekly Idol,
Knowing Bros and
KBS World's
Guerilla Date.
1 and 1 On November 15, 2016, Shinee released a repackaged version of their fifth studio album under the title
1 and 1 with five new songs, including the title track "Tell Me What to Do". The album included two CDs, one consisting of only the new songs and its instrumentals and a second one with the songs from
1 of 1. ==Concept and composition==