On January 28, Rainbow posted a puzzle teaser on their Facebook page, titled "Can You Guess the Name of the Title Song?". On February 1, they revealed the title song, called "Whoo". On February 5, they posted the first teaser picture for the extended play. On February 12, they released a teaser for the music video for "Whoo".[1] The extended play and official music video for "Whoo" was released on February 15.[2]
