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Aside from teaser images, little has been revealed about the group's comeback with their second digital single until now. As one of the youngest girl groups out there, "When I Grow Up" has the perfect theme for BONUSBaby. The MV teaser features scenes of the girls having a sleepover with a cheerful melody in the background. Unfortunately, one scene features a misspelling: "Bounsbaby."

BONUSBaby are set to return on April 20 KST, so stay tuned for more teasers until then!