ZEROBASEONE (Sung Han-bin, Kim Ji-woong, Seok Matthew, Kim Tae-rae, and Park Gun-uk) released a documentary-style behind-the-scenes video on their official YouTube channel on June 12, showcasing the production process of their sixth mini album 'Ascend-'. The footage captures the group's comeback preparation, including album meetings where members actively shared their opinions on track selection, song structure, and performance elements. The group demonstrated passionate dedication to recording their title track 'TOP 5' and engaged in intense choreography practice while maintaining a harmonious team atmosphere, even continuing practice during break times. The video also features behind-the-scenes content of Park Gun-uk's self-composed track 'Customize,' where he carefully crafted each sound element and provided personalized directing for the members, showcasing his musical capabilities. Moving between practice rooms and studios, ZEROBASEONE presented an expanded musical spectrum through the 'Ascend-' album.