It is described to demonstrate a sentimental, yet innocent teen-age love story. The fourth track, 'U & I', was written by Hwang Sung-jin and composed by Lee Joo-hyung and Lim Sang-hyuk.

The song is described to also have the '90's retro sound embedded in the track. The third track, 'Lover Boy' ( Korean: 사랑밖에 난 몰라), chosen as the follow-up track of promotions, was also written and composed by Kim Do-hyun, Seo Yong-bae and Seo Jae-woo. The song is described to be of 'new jack swing' style, which was popular during the '90s, and incorporates the solid vocal and rap skills of the members. The second track, 'Wow', also first title track of the EP, was written and composed by Kim Do-hyun, Seo Yong-bae and Seo Jae-woo. The song is described as a song that has a literal meaning of enjoying music by pressing the play button.

The first track of the EP, 'Press Play', was written and composed by Seo Yong-bae, Seo Jae-woo and by the singer G.NA, who also features on the song. On September 12, the EP and music video of 'Wow' were released digitally simultaneously.Īccording to Cube Entertainment, the concept of Press Play is “ a idea of the 'play' button on a cassette tape player and the meaning of the title is derived from the indication that 'BtoB play time is about to begin'”. On September 7, a teaser from the music video of 'Wow' was released. One day later, on September 6, Cube revealed teaser photos of the group together, as well solo shots of every member. On September 5, an audio teaser of the song 'Wow' was released on BtoB's YouTube account.

It was later revealed that the person on the photo is the member Sungjae. The image has a pop art theme and also shows the person on the photo making the word 'WOW' with their hands and mouth. A teaser image confirming the release was revealed by Cube Entertainment's Twitter account on Septemalong with the release date of the EP, September 12, the title track of the EP, titled 'Wow' and the EP's name, titled Press Play.

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