Yul, a transfer student in her class, turns out to be Prince Ui Seong. At first, Chae Gyeong has a hard time adjusting to life in the palace with its strict education and rules, but thanks to the warmth of the King and other Royal Family members, she begins to find the attractions of the Palace culture. Meanwhile, Hwa Yeong prepares to open a yoga center while plotting with Mr. Choi against the other Royal Family members. Yul becomes closer to Chae Gyeong and her friends. Prince Shin's birthday is coming up soon and Chae Gyeong is getting excited about the birthday party but the only people awaiting her are Hyo Rin and Shin's friends, who despise her.