Boy group B1A4 (B1A4) opened CNU's interview teaser video ahead of its online solo concert "Documentary Live – directed by B1A4" on December 5.

On November 30, WM Entertainment posted a video of CNU's interview on its official SNS channel. In the video clip released, CNU asked about the performance of Documentary Live – directed by B1A4 and said, "You can think of B1A4 as a performance that B1A4 made for BANA. Rather than showing you a perfect performance, we're going to show you the whole process before and after making the show, and we're going to show you how much we can relate to it."

In an interview held at the band's ensemble room, CNU wore glasses to show his debut days, making fans even more excited. CNU's unique dandy yet noble-looking soft charisma catches the eyes of viewers