Idol trainee Baek-ah experiences an earthquake during her training, and wakes up as Princess Su-ah. As rumors circulate that her engagement with Crown Prince Philip will end, she must win him back!. However, rival princesses compete to rob her of the prince, so she has to impress her love interest

Baek-ah aspired to become an idol. While rehearsing for her debut, the ground suddenly shakes, the wall collapses, and she enters a different world through the portal of the clock tower. When Baek Ah fell into a fairy tale book, she suddenly becomes engaged to Prince Philip. Kairos, the country of Princess Sua, was just a small country without a princess on the verge of collapse. Philip took special care of Kairos by his own authority and waited for Sua to wake up. However, when Baek-ah wakes up, she fails to remember the world in the book and disappoints Philip. He even brings up the story of breaking up. The imperial family held a ball. On the surface, it was a place to socialize with the princesses of the subordinate country, but in fact, it is a 'place of confrontation' to find a fiancée again…