015B was first played on NTS on 26 August 2025. Songs played include 아주 오래된 연인들.

In 1988, Jeong Seok-won formed a band called “Endless Orbit (무한궤도)” with Shin Hae-cheol, competed in a song contest and won the grand prize with the song, “To You.” After the contest win, the band’s debut album was warmly received but Jeong Seok-won and Shin Hae-cheol parted ways due to musical differences. Shin Hae-cheol debuted as solo singer and Jeong Seok-won, Jo Hyung-gon, the bassist of the band, and Jeong’s brother, Jang Ho-il, created the band 015B. The Chinese characters of the band’s name, 015B(空一烏飛), means ‘a crow flies across the sky.’