Cheon Kingdom is the peacefull and pleasant Kingdom that was headed by King Cheon Sejong, a wise and nice king that really hate the war. He even hate the blade and never do any violence in his Kingdom. His queen was died and he just has his lovely princess who accompany his life, Cheon Seong Im. The King never show his princess to public because of his big protective to his only daughter, he was grew her up so well, he will full everything that she want and that's why Seong Im become a beautiful, cute and lovely princess. He grew up with his father's love shower, she never through any pain and suffer, she always get every of her wish from the King. But one day, when she was 19 years old, her father finally not allow her to get her wish to marry with her first and only love Joon Ji Hoon who also her cousin. Her father deny her wish even he knew his princess was madly in love with him.  For Seong Im who just live happily in the palace, she just has two people who she rely on beside her father, that are prince Joon Ji Hoon and his bestfriend commander chief Kim Jong Kook who are 5 years older than her. Since her childhood, those two guys are the person who always accompany her, the kind hearted prince Ji Hoon who give her a comfort and the bad Jong Kook who always bully her around. One day, Ji Hoon visit the palace after his long journey somewhere and it give a big happiness for Seong Im, when she feel that she will do her best to get Ji Hoon's heart and persuade the King to permit her marriage, she has to face that her only dream crack when she accidentally watch Ji Hoon kill her father personally. She is extremelly has mental breakdown from the scene, Ji Hoon is betray the King and plan the revolt to be the next King. Ji Hoon even make Seong Im as a fugutive and she finally run away from palace with her only loyal commander Kim Jong Kook. To be a stronger princess who will get her kingdom back, she has to leave her beautiful live and start her hard live together with Jong Kook, so she will able to come back to the palace and become the only queen of the Kingdom.