Consisting of seven tracks in total which incorporates various genres including dance-pop and hip hop, the EP became a commercial success for the group, reaching over 150,000 copies sold by September 2016.

JYP Entertainment announced that the group's comeback will "show an even more lively side of Twice" and further added that they will begin promotional activities for the upcoming album in the following week.

The seventh track "I'm Gonna Be a Star", which served as the theme song for Sixteen, was announced to be included only in the physical copy of the album.

Contents of the physical album (which comes in two versions: pink and mint) was also revealed, and it was announced that 30,000 limited edition copies featuring a special sleeve designed by member Chaeyoung was available.

[2] On April 18, the group released their first music video teaser for "Cheer Up", which ranked first in real-time Korean search engines.

[11][12][13] On April 22, the group released a music video teaser clip featuring all the members, revealing a snippet of the lead single's audio.

"Cheer Up" is a dance-pop song that incorporates multiple genres, including hip hop, tropical house, and drum and bass; this blend was described as "color pop".

The song was re-arranged in a house dance style with electronic instrumentation and hip hop rhythms, and features a new rap written by Chaeyoung.

[22] "Woohoo" was described as a hip hop song with "groovy beats", and "My Headphones On" is a pop ballad about a girl's breakup.

The trophy on the May 27 edition of Music Bank was initially awarded to AOA before the show's producers admitted they had miscalculated the album points.