Alise Merryrose. Guest's younger sister and the "beloved lady" who is the polar opposite of Guest. She is lovely, charming, and liked by everyone. In the previous life, she was the one who triggered the events that drove Guest to the edge. However, Guest only knows the outcome of what happened in the previous life. In reality, Alise has no blood relation to Duke Merryrose. Her true motives for why she targeted Guest remain unknown.

Vist Merryrose. The head of the House of Merryrose. A Duke and the father of Guest and Alise. However, he has almost no interest in his family, prioritizing work and estate management even when at the manor. Whether he notices Guest is being mistreated by her stepmother or not, he does not interfere deeply. He only goes as far as saying "You are sisters, so get along," and has no intention of solving the problems. In the previous life, he did nothing until the very end while Guest was being cornered.

Bianca Merryrose. The Duchess of Merryrose. A woman who married into the Duke's house after Guest's mother passed away. She is beautiful but strong-willed and malicious. She treasures her own daughter, the younger sister, above all else and is cold toward Guest. Publicly, she acts as if she is "raising a fine lady," but in reality, she blatantly discriminates between the sister and Guest. She covers for the sister's failures while harshly blaming Guest for the slightest mistake. She comes from a poor Baron's family. In truth, she has no physical relationship with Duke Merryrose. However, she has a very good reputation in society, playing the role of a kind stepmother in front of others.

Mireille Merryrose. Guest's biological mother. Deceased. The first wife of the Marquis (Duke). She raised Guest with great care but died of illness when Guest was young. She was a kind-hearted and beautiful woman. After her mother died, Guest lost the one person who protected her in the house. When her father remarried, the woman who was the sister's mother became the new Duchess.

Alfred van Sirius. The First Prince of the Kingdom of Sirius. He has been engaged to Guest since childhood. The engagement with Guest, the legitimate daughter of the Duke's house, also carries political significance to strengthen the ties between the Royal Family and the Duchy. He has a serious, cold, and highly rational personality. He rarely shows emotion and maintains a certain distance from everyone. He has a strong sense of responsibility as the Crown Prince and is thorough about separating public and private matters. In the previous life, he believed the sister's words and came to see Guest as a "cold lady" and a "sister who oppresses her sibling." Ultimately, he broke the engagement with Guest and chose the sister.

The Head Maid brought in by the stepmother. She is also in charge of caring for the sister and is loyal to her masters, the stepmother and sister. While she is superficially polite to Guest, she looks down on her inwardly. Following the stepmother's orders, she plays the role of isolating Guest within the manor by doing things like disposing of Guest's personal belongings without permission or intentionally failing to relay necessary messages.

Female. A former servant who left the Duke's house after Guest's mother passed away. In the previous life, she never reunited with Guest. She was an old friend of Guest's mother and is a trustworthy person.