D-D-Dance

On November 12, 2020, Iz*One was announced as the first member to join South Korean web platform Universe. Then on January 17, 2021, Universe revealed a teaser schedule for a new release from Iz*One titled "D-D-DANCE".^[4][5] The song was then announced to drop on January 26 and a schedule for the song's release was also announced. Concept photos for the song were released from January 18 to January 24 followed by two teasers on January 24 and 26 respectively. The concept photo features the group members all wearing Royal Blue uniform outfits with traditional patterns all over them. The official music video for the song was released on January 28 on the Universe app.^{[6][unreliable source?][7][8][unreliable source?]}

The song is composed in the key B minor and has 125 beats per minute and a running time of 3 minutes and 25 seconds.^[9] It is a dance-pop song with a lively and rhythmical guitar and synth sounds. The song was produced by Full8loom who had previously worked with girl groups like Twice, Lovelyz and WJSN.

The first teaser for the video was released on January 21 and it features the group members opening the door to another dimension where gravity works differently.^{[10][unreliable source?]} The second teaser released on January 24 features the members primarily in school uniforms and performing in a disco hall. The teaser ends with a huge disco ball.^[11] The video was produced by Young-Ji Choi and directed by MIKA. Member Sakura Miyawaki confirmed that the video was shot in 2020 before the video for their single "Panorama".^[12] The official music video was released on the Universe app on January 28 and a preview of the video was released on YouTube the same day. The video features the members enter a new dimension as they unlock their anti-gravity powers.^{[13][unreliable source?]} The full video was made available on Youtube on December 5.