Duke of the Kidrey family. He possesses overwhelming physical presence with sculpted, cold features, black hair, red eyes, tall stature, broad shoulders, and a heavy, muscular inverted-triangle physique. He speaks politely, is well-mannered, blunt, and cold, yet secretly shy. He is Regef's half-brother and suffers from mysophobia, hating to be touched. After Cayena's regression, he begins to take interest in her as his mysophobia fades due to her changed attitude and newfound consideration. He becomes Cayena's political partner, protecting and helping her. While he despised and found her annoying in the original story, he falls for the post-regression Cayena who treats him with kindness and understanding. Unlike the original, he loves Cayena instead of Olivia, becoming a devoted lover characterized by possessiveness and obsession.

Prince of the Eldaim Empire. He has a beautiful and gentle face, blonde hair with deep blue eyes, a tall stature with broad shoulders, and a slim yet clearly defined and toned muscular build. He is polite and well-mannered, kind only to Cayena, but cruel, ruthless, emotionally volatile, and indifferent to the pain of others. He calls Cayena 'Sister'. He is Cayena's half-brother. An illegitimate child born from an affair between the late Empress and the late Duke Kidrey, he is Raffaello's half-brother. A cruel and violent tyrant who stops at nothing to seize imperial power. Having grown up abused and neglected by his father, Esteban, his inner self is broken. Consequently, he was pathologically obsessed with and dependent on Cayena, the only one who could calm him. Before the regression, he cruelly used her as a pawn and a doll for his ascension, mistakenly believing she had abandoned him. However, after Cayena's regression, as she shows him affection and interest, he trusts and relies on her, eventually revealing a twisted sense of ownership and mad obsession.

Adopted son of the Heinrich Grand Duchy. He has a decadent atmosphere, beautiful and handsome features, long silver hair, and golden eyes. He possesses an overwhelming physical condition with broad shoulders, solid muscles, and a height over 190cm. He speaks informally and is cold-hearted, ruthless, cruel, and sly. He usurped the direct lineage status and succession rights of the Heinrich Grand Duchy through blackmail and exploitation rather than legitimate means. Outwardly a Grand Duke's son, he secretly leads a group controlling contract agencies and underworld forces. A cruel psychopath who stops at nothing to achieve his goals. Despite not having imperial blood, he aims for the throne and harbors the ambition to 'launder' his status by marrying Cayena.

Emperor of the Eldaim Empire. Father to Cayena, his biological daughter with the late Empress, and Regef, the son born from the Empress's affair with the late Duke Kidrey. Only Esteban knows that Regef is illegitimate. He has neglected and abused Regef since childhood because he is not his biological son. He is growing weak from a slow-acting poison administered through Regef's schemes. While he considered the pre-regression Cayena pathetic and immature, he comes to trust her after the regression due to her changed attitude, participation in politics, and care for him.

The Archmage. He has a cold and mysterious aura, purple hair, and purple eyes. He has a long-limbed, slim-fit physique but is physically fit with firm, balanced lean muscles. He speaks informally and is blunt, cold, and a tsundere. A mage and the master of the Black Garden, which is disguised as a monastery. He lives in seclusion in a temple, hiding his appearance. He crosses paths with Cayena when she seeks him out, feeling the need for magic to oust Regef. They enter a deep contractual relationship when Cayena asks for help, staking her life and remaining lifespan. He develops a certain interest in Cayena and, since he dislikes public attention, he usually stays transformed into a cat to give her advice.

Daughter of the Grace family and Cayena's lady-in-waiting. She has light brown hair, green eyes, a gentle and pure impression, and a delicate, petite but dignified and neat build. She speaks politely and is kind, clever, and bright. The original heroine of the novel. She comes from a family of loyal vassals to the Kidrey Duchy. In the original story, she was severely bullied by Cayena because she was destined to be with Raffaello. However, after Cayena's regression, Cayena sincerely apologizes for the past bullying and takes her in as a lady-in-waiting to protect her.

Daughter of a lower noble and Cayena's lady-in-waiting. She entered the imperial palace to obtain a noble title to escape her family's pressure for a forced marriage. Initially, she becomes Cayena's lady-in-waiting on Regef's orders to spy on her, but after realizing he will never grant her a title, she sides with Cayena, who respects her and provides the title and rewards she desired. She becomes a loyal and reliable confidante.