[3] Kim June-one (김준원) and Kang Hyuk-jun (강혁준) were both born in South Korea, but spent much of their childhoods abroad, listening mostly to Western music.
"[1][5] They changed the band's name to Glen Check, and began releasing electropop and synth-pop music, starting with their first EP, 2011's Disco Elevator.
[9] That same year, Melissa Locker of Time singled out Glen Check as her favorite band from South Korea, praising their "edgy '80s energy" and "style that's nearly impossible not to dance to.
The album was a departure from their synth-pop sound and featured genres including psychedelic rock, old school hip hop, acid jazz, and techno.
[15] A second track on the album, "4ever," was used as a leitmotif, or recurring refrain, to highlight key moments in the series when two cast members progressed their relationship, or an individual showed emotional growth.