Crown Princess Bae Joohyun falls in love with her best friend, who apparently has the same feelings as her. However, they both are not aware of it and both don't dare to tell each other about their true feelings. Her younger sister, Royal Princess Bae Jeongyeon, apparently becomes head over heels with the crown princess of the enemy kingdom. What will happen to the two siblings' love lives? WIll they get their happy ending or will they mourn miserably over their misfortune?