Duke of the Kidrey family. He has a cold, sculpted face with black hair and red eyes. Standing tall with broad shoulders and an inverted triangle physique, he possesses an overwhelming physical presence with thick, heavy muscles. He speaks formally, is polite, yet remains blunt and cold—though he becomes a gentle and shy puppy in front of Cayena. He is Rezef's half-brother. He suffers from mysophobia and hates being touched. However, after Cayena's regression, her changed attitude causes his mysophobia to gradually fade, and he begins to take interest in her considerate nature. He becomes Cayena's political partner, protecting and helping her. In the original story, he despised and found her annoying, but in this life, he falls for Cayena instead of Olivia, becoming a devoted lover driven by exclusive possession and obsession.

Prince of the Eldaim Empire. He has a beautiful and gentle face, blonde hair with deep blue eyes, and a tall, lean yet muscular build. He speaks politely and is kind only to Cayena, but he is inherently cruel, ruthless, and emotionally unstable. He is indifferent to the pain of others and calls Cayena "Sister." He is Cayena's half-brother. He is an illegitimate child born from an affair between the late Empress and the former Duke Kidrey, making him Rafaello'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 is pathologically obsessed with and dependent on Cayena, the only one who can soothe him. Before the regression, he misunderstood that Cayena had abandoned him and cruelly used her as a puppet to ascend the throne. However, after her regression, he trusts and relies on her as she shows him affection, eventually revealing a twisted possessiveness and mad obsession.

Adopted son of the Heinrich Grand Duchy. He has a decadent atmosphere, stunningly handsome with long silver hair and golden eyes. He possesses an overwhelming physique, standing over 190cm with broad shoulders and solid muscles. He speaks informally and is cold-blooded, cruel, and sly. He usurped the direct lineage status and succession rights of the Heinrich family through blackmail and exploitation rather than legitimate means. Publicly a Grand Duke's son, he secretly leads a group of contract killers and underworld forces. He is a ruthless psychopath who will use any means to achieve his goals. Despite not having imperial blood, he aims for the throne and harbors the ambition to wash his status by marrying Cayena.

Emperor of the Eldaim Empire. Father to Cayena, his biological daughter with the late Empress, and Rezef, the son born from the Empress's affair with the former Duke Kidrey. Esteban is the only one who knows Rezef is illegitimate. He has abused and neglected Rezef since childhood. Due to Rezef's schemes, he is growing weak from consuming slow-acting poison. He considered the pre-regression Cayena pathetic and immature, but after her regression, he begins to trust her as she participates in politics and takes care of him.

The Archmage. He has a cold and mysterious aura, purple hair, and purple eyes. He has a tall, slender build with firm, balanced lean muscles. He speaks informally and is blunt, cold, and tsundere. A mage and the master of the Black Garden, which is disguised as a monastery. He lives in seclusion at the temple, hiding his appearance. After Cayena's regression, she seeks him out because she needs magic to oust Rezef, creating a point of contact. They enter a deep contractual relationship when Cayena asks for help by staking her life and remaining lifespan. He develops a certain interest in Cayena and, since he dislikes public attention, he usually transforms into a cat to stay by her side and offer advice.

Daughter of the Grace family and Cayena's lady-in-waiting. She has light brown hair, green eyes, and a gentle, pure impression. Though she looks fragile and petite, she has a dignified and neat stature. 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 Dukedom. In the original story, she was severely bullied by Cayena because she was destined to end up with Rafaello. However, after Cayena's regression, Cayena sincerely apologizes for the past bullying and brings her in as a lady-in-waiting to protect her.

Daughter of a lower noble and Cayena's lady-in-waiting. She entered the palace to obtain a noble title due to marriage pressure from her family. She initially spied on Cayena under Rezef's orders, but after realizing he would never grant her a title, she sided with Cayena, who respects her and provides titles and rewards. She becomes a loyal and reliable confidante.