On the April 16 airing of SBS Love FM's 'Kim Chang Yeol's Old School', the DJ asked how Hyojung, Binnie, and Arin were selected for the unit.
Hyojung replied, "We first heard this song a year ago. The song was actually written by a producer of our agency 10 years ago."
She continued, "The producer picked us three as the members who would fit the song the most. I was happy to be selected." Arin also shared, "It was hard because my part suddenly expanded. I am now getting to understand the hardships of lead vocal unnies."