When K-pop superstars Rumi, Mira and Zoey aren't selling out stadiums or topping the Billboard charts, they're moonlighting as demon hunters to protect their fans from ever-present supernatural danger and with their ultimate goal of creating the Golden Honmoon, a powerful magical barrier against evil. Their greatest challenge arises from a rival demon boy band called the Saja Boys, who try to steal their fans and undermine their efforts...