"One" was released as the first promotional single for x to provide a classic ballad counterpoint to the more upbeat, experimental lead single, "Sing".

Sheeran wrote "One" as the final song inspired by his former girlfriend, Alice, who was the subject of many tracks on his debut album, + .

The official music video for "One" is a minimalist, black-and-white performance piece that captures the emotional weight of Ed Sheeran's farewell to a past relationship. Key Facts and Production