Following the release of Basic in 2015, Brown Eyed Girls took an unofficial four year hiatus, which the member Gain cited was due to her taking a personal leave from the group in order to be with family and take vocal lessons to expand her role in the group from dancing.

Member JeA also moved to Jeju island while Miyro continued to be active on YouTube.

[2] Narsha left APOP Entertainment in 2018, also stating that she would continue being a member of Brown Eyed Girls.

[1] On January 28, 2019, APOP Entertainment confirmed the group was planning to come back in the first half of the year.

[9] The album received positive reception, with Billboard describing the album as "a walk down memory lane of South Korea's sonic history with Brown Eyed Girls’ distinct artistic flare melded into it, adding something a little edgy and a little provocative into [the] songs.