Urban Zakapa has released a new single album titled "7".

The album features two tracks: the title song "Blue Diamond" and the b-side track "Unboxing".

Cho Hyun-ah took charge of everything from lyrics, composition, and arrangement to overall production for both songs.

"Blue Diamond" is a song that delivers a message about breaking away from complex realities and standards to move forward at one's own pace.

It metaphorically compares the self to a blue diamond, which is difficult to find easily.