Princess Leonora of Kingsland is the current princess of Kingsland, daughter of King Kendrick and sister to knight and heir to the throne, Prince Alexander. As a princess, she has thw known clique "damsel-in-distress", but instead of mourning to be saved, she enjoys to be kidnapped, and even puts herself in danger on purpose for her own desires.
As brother and sister, sometimes they love each other, and sometimes they don't. Not exactly a very serious thing, but Leonora and Alex have different preferences for many topics. Alex is annoyed by her "strives to be kidnapped" because in this case, he's the one who is supposed to save her.
In Season 2, it is revealed that Leonora is being overprotected by her brother after a misunderstood fact that she was cursed at birth, in which she's annoyed about. Even if they have a tough love trope in their relationship, both care deeply about each other and so goes on.