orologio en CB01 OFFICIAL. On her first day in the high school flute club, Jeen fails to play for her seniors when her flute makes no sound and her ears start ringing. Losing her confidence, she grows closer to Na, a beautiful senior who promises to help. However, Na slowly begins to control Jeen's life. As Jeen notices her senior's disturbing behavior, she must reject Na's demands, leading to a major turning point in her life.