On August 19, MCND released a self-written message about its comeback along with "MCND [EART AGE ] SHOWCASE D-DAY Special Photo" on its official SNS channel.

"We're making a comeback in about three months," said leader Castle J. "We worked really hard on this EART AGE album," he said. "We really wanted to show our performance and let you listen to our music."

Minjae also said, "The title song 'Nanana' is a spectacular performance and a better group dance," drawing attention from fans.