Just when Lee Zena was finally ready to debut as a K-pop idol, her group was scrapped because of backlash from a scandal involving Ju Siu, former member of another girl group under the same entertainment company. But after a mysterious person named "T" contacts Zena, she now sees game holograms that say her only hope of debuting is to appear on a survival idol program called "To Be Dol" with none other than Siu. As they face one mystery after another, how will Zena and Siu ever debut together?