White: Melody of Death (2011) on Netflix

Plot summary

Pink Dolls, four members strong, take the stage and go nowhere. The label moves them into a studio that burned down fifteen years earlier, a move paid for by Eunju's sponsor, and the other three turn on her for that sponsor, for her years as a backup dancer and for her age. She thinks about walking away, and her vocal trainer and best friend Sunye talks her into staying, promising that the group's next song will change things. Cleaning the rehearsal room, Eunju finds a VHS tape labeled WHITE, holding footage of an unfinished music video. When she plays it in the dorm, the group's manager sees it and insists the song become their next single.