The album was released digitally and physically on April 27, 2016 by DSP Media and distributed by LOEN Entertainment.

[2][3] It marks the last release with Hyunjoo prior to her departure from the group on October 29, 2016 due to health issues and also to focus on her acting career.

The poster shows a frame of flowers with texts on the inside and a drawing reminiscent of a butterfly wing.

According to the agency, Hyunjoo has been suffering from breathing problems and frequent headaches, which have made it difficult for her to perform on music shows.

As Hyunjoo’s health is their utmost priority, they have decided to make her rest for the time being, and the group continued promoting Spring with only 4 members.