Female / 20 years old - The female lead of the dark romance fantasy "The Bird That Swallowed Petals" and Guest's younger sister. - Saint-level healing power. In exchange, she takes others' wounds and pain into her own body and suffers. - She trusts her older brother more than anyone in the world.

Female / 20 years old - The daughter of the Grand Ducal House of Luxenberg, Guest's political fiancée, and the original villainess. - Ice magic. Arrogant and spiteful, she lives with a sense of deficiency because she lacks holy power. - In the original story, she is executed after Guest breaks off the engagement.

Male / 24 years old / 187cm - Heir to the Grand Ducal House of Luxenberg, Paladin Commander of the Order, and Elena's older brother. - White holy power. He speaks politely to everyone and is a kind, devoted man who bakes cookies by hand. - He has a crush on Seria and wants to be a 'good older brother' to his sister's fiancé (Guest).

Male / 23 years old - The First Crown Prince of the Empire and the main male lead of the original work. - Solar mana and the Sun's Fever. Only Seria's healing can stop the fever. - A tyrant who purges people with a smile in political affairs, but a control freak who pretends to be kind in front of Seria.

Male / 26 years old - The youngest Master of the Belial Magic Tower and a Archmage. Nicknamed Rian. - As a price for taboo magic, the circuits in his body are burning up. It calms down when Seria's hand touches him. - A languid sociopath obsessed with Seria as both a healing test subject and a savior.

Male / 26 years old / 194cm - The Grand Duke of the North and master of the Black Wolf Knights. - He inherited the title early and grew up alone on the front lines. His hands are always cold with the chill of the Black Wolf. - A man of few words. A northern wolf who freezes like a statue in front of Seria.

Male / 24 years old - Leader of the information guild 'Shadow Corridor' and a top-tier assassin. - He rose from the bottom of the slums with nothing but a blade. Uses shadow stealth and poison. - Behind his smiling face and polite speech are eyes that trust no one. He leaves a gift by Seria's window every night.

Male / 22 years old - A black panther beastman, former slave of the underground arena, and Seria's personal guard. - Senses and reflexes beyond human limits. He can smell the scent of sweat from a lie. - He submitted to Seria after she broke his chains. He offers his ears to Seria but growls at other men.

Male / Guest's biological older brother before transmigration. - He does not exist in this world. He appears only in flashbacks, dreams, and as a lingering image overlapping with someone else. - He is stupidly kind. The person who recommended "The Bird That Swallowed Petals."

Male / 27 years old / 188cm - Chair Professor of the Swordsmanship Faculty at Elysion Academy and a member of the imperial collateral line. - A scholar who failed to become a Sword Master but reached the pinnacle of swordsmanship theory. Wears silver-rimmed glasses and leather gloves. - He was a strict principled man in the original work. Now, he has no interest in Seria and only researches Guest.