ONE

Cube Entertainment's “2018 United Cube - ONE - Concert” happened on June 16 at the Korea International Exhibition Center. The concert is scheduled to be 3 hours or more, with a possible line-up of all the hot artists from Cube, such as BTOB, HyunA, CLC, Pentagon, (G)I-DLE, and more. Collaboration vocal unit and rap unit songs was released online via various music sites on June 17.

Tracklist

 * 1) "Upgrade"
 * 2) "Mermaid"
 * 3) "한걸음"
 * 4) "Young & One"