The CLEF Company announced on August 13 that D1CE will participate in the project through its official SNS channel and announced that the teaser will be released through various music sites and SNS channels such as YouTube at 6 p.m. on August 14.

The "CLEF CREW Project," which D-ONE participated in, is a new project in 2020 of the music publishing "CLEF Company," which plans a collaboration of talented songwriters and artists every year and releases new music.

Meanwhile, the teaser video for the project's new song "One Summer" will be released on various music sites and social media channels such as YouTube at 6 p.m. on August 14.