One Day is the debut single album by South Korean rapper One.

It was released on July 11, 2017, by YG Entertainment and distributed by Genie Music.

It was One's only musical release under YG before his departure on July 7, 2019.

The single album was digitally released on July 11, 2017, through several music portals, including MelOn in South Korea, and on iTunes worldwide.

[8] The song "Gettin' By" debuted at number 59 on the Gaon Digital Chart, on the chart issue dated July 9–15, 2017, with 34,949 downloads sold.