It was released digitally on March 13, 2018, by YG Entertainment, as a gift and a final farewell from the group to its fans ahead of a lengthy hiatus, as the band members serve in South Korea's mandatory military service.

[7][8] Previously on March 8, YG Entertainment announced that on the day of Daesung's military enlistment, the group would release a new digital single as a gift to fans.

[10] The song was created while BigBang were working on their album Made, and the lyrics were written with the future enlistment of the members in mind,[9] which is highlighted in the lines "this is not the end of us / I hope we'll meet again when the flowers are blooming", a request for the fans to wait for them.

"[3] The title of the track, "Flower Road", is a Korean term referring to a "new, glorious journey", which could be interpreted as both the group's or their fan's path.

[1] The single also contains a "smooth dance-pop vibe", with BigBang's "evocative vocals" being put in the "front and center", while the melody "alternates between rhythmic guitar riffs, a clapping beat, and wailing synth.

[19][20] Tamar Herman of Billboard described "Flower Road" as "balancing out melancholy and optimism", because the track "is an homage" to the quintet's "relationship with the millions of fans around the world who have supported them for over a decade.

Hur also wrote that "the song holds a sound unique to the group", with the "contrasting emotions" that "balanced out the intensities of each and succeeded in creating a soft atmosphere", mainting a "a light, bright mood from beginning to end", which she described as "perfect to accompany us in the upcoming spring".