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."

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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."