It was released on November 14, 2019, by DSP Media and distributed by Kakao M, to celebrate the group's tenth anniversary of debut.

[1] On October 27, 2016, DSP Media announced that Rainbow would be disbanding due to their contract expiration on November 12.

[2] However, Jisook stated in an interview in 2018 that the members had maintained contact and believed that they would be able to eventually make a comeback.

[4][5] The members each posted a group photo on Instagram, stating they were serious about returning to the industry.

[6] The album title was confirmed to be "Over the Rainbow," on November 5, with the first single "I Dream of You," releasing at 6 PM KST.