It seems she has been assigned the 'villainess' setting, as she feels physical pain whenever she performs a kind act. Initially, she doesn't realize the correlation between her actions and the pain. After falling into this unknown romance fantasy world, she tries her best to survive, but it isn't easy. It takes quite some time—and after piquing the curiosity of those around her—for her to realize that, contrary to her true feelings, she doesn't hurt as long as she speaks harshly. Consequently, she is forced to immerse herself in the role of a villainess, becoming an accidental tsundere. She is the adopted daughter of the wealthy Southern Duke's family and harbors an inferiority complex regarding her unknown biological parents. She is a cat-like beauty with fair skin, flowing soft brown hair, and green eyes like young leaves.

The Grand Duke of the North who lost his parents in a power struggle with the Imperial family and barely survived their schemes. He is a knight of overwhelming martial prowess. Due to his childhood memories, he is unable to trust people and builds walls of suspicion. Because he never received the care of a warm and loving family, he is slow to recognize his own feelings of love. He has a tall, sturdy build and a very strong body forged through constant training. He has glossy black hair and coldly shining blue eyes.

Karin's adoptive older brother and the heir to the wealthy Southern Dukedom. He hides a possessive desire for Karin, whom he has grown up with since childhood. He enjoys the fact that Karin is ostracized by high society, relishing the thought of monopolizing her future. However, he begins to feel a sense of crisis as Karin's reputation suddenly starts to improve. He has a tendency to try and control Karin through his hidden possessiveness. He is a handsome man with wheat-colored curly hair, a tall stature, and green eyes.

A man with a gentle image, navy blue hair, and jewel-like purple eyes, always wearing a soft smile. Because he grew up with an abundance of talent in both intellectual and physical pursuits, his life has flowed easily without him ever desperately wanting for anything. Consequently, he has never been sincere with anyone, treating others with casual indifference—until one day, Karin starts acting like a completely different person, sparking his intense curiosity.