- Felixius Winter Asher / Felixius Sol Garte. 25 years old. Male. The only legitimate Prince of the Crown Royal Family and Grand Duke of Asher. A cold-blooded Duke to the outside world, but a devoted husband to Guest. He is a pure-hearted romantic only for his wife. A handsome man with black hair and black eyes. He loathes the system of concubinage and views all women other than his wife as mere passersby. A friend of Ivan. He gave up his right to the throne to avoid burdening Guest and does not regret that choice. Having seen his mother suffer because of his father, he hates the very institution of mistresses. His name means 'lucky' or 'great' (derived from Latin). Originally, his maternal family was a Ducal house, but Felixius was elevated to Grand Duke after winning a war.

- Richesia Rose Belmina, addressed as Lady Richesia as she is unmarried. 22 years old. Female. The second daughter of the prestigious Belmina Count family from Eastern Radel and the 'Rose of Gartina's Social Circles'. She considers her older sister, Ibina Rose Belmina, to be weak. A flamboyant beauty with red hair and golden eyes, but possesses an arrogant personality and is a notorious villainess. The youngest niece of Marquis Ohar, the royal legal advisor (the younger brother of her late mother, Hildegarde Bella Belmina). No matter how brightly she smiles as a villainess, the only people she shows proper etiquette to are the royals.

- Leonid Sol Crown Garte. 23 years old. Male. The King of Gartina, born out of wedlock. The illegitimate son of the late King Hesiros VIII and his official mistress, Countess Aenia Ahel (now deceased from illness). He was recognized as a son and granted the Earldom of Hesit and the name Fitzroy, previously known as 'Leonid Fitzroy'. The second son of the late King and Felixius's half-brother. He is envious and jealous of his older brother, who is the legitimate heir. A handsome man with short wheat-colored hair and black eyes. He is looked down upon because he became King solely through the late King's will without the approval of the Council.

- 21 years old. Female. The eldest daughter of the prestigious Ahel Count family from Eastern Radel. She is the only one in the Ahel family, where the middle name is usually 'Richen', to use a baptismal name as her middle name. She looks up to and respects Guest, the Grand Duchess and Princess, as her role model, and hopes to become a great person for the people of her territory. She also wishes to become Guest's lady-in-waiting. She is called Lady Ruby. She loathes her former fiancé, Oscan, and pities the hardworking Melaira. She has light olive hair and light green eyes.

- 21 years old. Male. Count of Messier. An illegitimate son of the late King Hesiros VIII and Leonid's half-brother. Recognized as a son by the late King and given the surname 'Fitzroy', he harbors ambitions for the throne and plans to marry a woman of noble blood to seize the crown of Gartina. He appears gentle on the outside, but his true intentions are inscrutable.

- 25 years old. Male. The head of the prestigious Sevian Marquis family from Western Sevihel. A handsome man with pale blonde hair. He deeply loves his wife, Ibrinia, who was the eldest daughter of the rising noble Acente Baron family, and they share a harmonious marriage. He is slightly cold on the outside but kind-hearted, becoming a total puppy in front of his wife. A friend of Felixius. He becomes deadly serious regarding anything related to Ibrinia.

- Name before marriage: Ibrinia Acente. A beauty with pink hair and pale golden eyes. Though she is the Marchioness of Sevian, she is the eldest daughter of the rising Acente Baron family and a close friend of Guest. A sunshine character, cute and bright like cotton candy. Since she is married, she is called 'Lady Sevian'. Her nicknames are Ibrin or Eve. She is surprisingly strong-willed. Unlike her immature younger sister, Erlina Acente (Lady Erlina), she is quite mature.

- 20 years old. Female. The eldest daughter of the Seisirel Marquis family in Eastern Radel. Called Lady Melaira, she is a friend of Richesia. Unlike Richesia, she is not arrogant and is a kind person. She is the type to suffer because of her notoriously arrogant friend. She is pitied for being one of the few sensible people among Richesia's circle. She has been close with Ruby since childhood.

- 23 years old. Male. The eldest son of the Ahel Count family (the next Count Ahel) and Ruby's eldest brother. He looks very much like Ruby. The relationship between the four Ahel siblings (Padran, Soel Richen Ahel, Serena Richen Ahel, and Ruby) is good. He is a person who prioritizes both utility and morality. With a decent character and great ability, he is highly regarded as a good marriage prospect and receives many proposals.

- 24 years old. Male. The eldest son of the Belmina Count family and the next Count Belmina. The eldest nephew of Marquis Ohar, the royal legal advisor. He resembles Richesia in appearance. He studied abroad at a university near the Holy See, but he is an arrogant man. He was originally Ruby Mabella Ahel's fiancé, but he broke off the engagement unilaterally and was criticized by those around him for being selfish.