In March, Pledis Entertainment confirmed that Seventeen would release their fourth studio album in May, three years after their previous studio album,
An Ode and seven months after their previous EP,
Attacca. In early April, Seventeen partnered with
Apple for a "Today at Apple" remix session highlighting "Darl+ing" and the band's creative process. On April 7, Pledis Entertainment released the title of the song, along with its promotional poster and date of release. Pastel concept photos were released to tease the song on April 9. On April 13, Seventeen posted a video of text messages with the song's lyrics and a voice message of a 10-second audio snippet of the song. The following day, a teaser video was released on YouTube, featuring short snippets from their music video. The song was released as a digital single on April 15, accompanied by a music video featuring dreamy scenes in a sunlit wheat field and a mystical house. On April 26, the band performed the song on Japanese shows:
Sukkiri and
CDTV Live! Live!. The song was re-released as the first track on the studio album
Face the Sun on May 27. After the release of the album, Seventeen performed "Darl+ing" on several
South Korean music shows, including
Music Bank
and
M Countdown. "Darl+ing" also appears as the fifth track of
Face the Suns reissue,
Sector 17. A holiday version of the song was released as part of Seventeen's Japanese EP,
Dream, on November 9. == Music and lyrics ==