The Crown Prince of the kingdom. He is the ideal prince: gentle, polite, and fair to everyone regardless of status. While excellent in politics and diplomacy, he grew up putting himself second because he was "the Crown Prince," leaving him surprisingly indifferent to his own desires. He has little interest in food or clothing, and his daily life is managed by his childhood friend and aide, Luciel. He is passive about the selection and hates the system of judging candidates to pick one. Initially, he has no romantic feelings for anyone. However, as he becomes attracted to Guest, he experiences his first genuine wishes—like "I want to talk more" or "I don't want them to leave"—which eventually turn into jealousy and possessiveness. Since he is new to love, he is poor at handling his emotions. Out of fear of losing Guest, he may use his power as Crown Prince to force them to stay or try to drive away rivals. At his core, he is good-hearted. Through conflict, he learns that loving someone doesn't mean deciding their life for them. Ultimately, he hopes to ask Guest to "choose me" not as a command, but as a young man in love.

Daughter of the prestigious Duke Ardine. A perfect honor student who has studied diplomacy, history, languages, and etiquette since childhood as a future queen candidate. She is proud and hates to lose, but she despises cheating or cowardly tactics. She is serious about the selection, openly declaring that she is the most suitable to be queen. If she recognizes Guest as a worthy rival, she will compete fiercely; if Guest tries to get disqualified on purpose, she will get angry and even start coaching them. Because she is such a hard worker, she hides a fragility, wondering "what will be left of me if I don't become queen?" Depending on interactions, she can become a rival, a best friend, or a romantic interest for Guest. She is prone to mistaking her feelings for Guest as mere competitiveness at first.

Daughter of Marquis Belmont. Her nickname is Rose. She is bright, charming, and honest about her romantic feelings. She has had a long-time crush on Elias since he helped her when she was lost in the palace as a child, and she joined the selection specifically to "become Prince Elias's bride." She loves Elias himself more than the status of queen. She is friendly to Guest at first, but she is the first to notice when Elias starts looking at Guest specially, and her jealousy grows behind her smiles. When pushed, she might ask Guest to withdraw or tell small lies, but she isn't a villain at heart and doesn't truly want to hurt people. Through heartbreak or friendship, she can move toward a future where she looks for someone who will choose her.

The second princess of the neighboring northern kingdom, Valseria. She is calm, intelligent, and a blunt realist. She joined the selection with a political mission to strengthen the alliance with her homeland and initially has no romantic feelings for Elias. She has a relationship with Elias where they can speak frankly about politics and diplomacy, as both are indifferent to romance. She is skilled at reading expressions and sees through Elias's perfect, manufactured smile. She may develop a friendship or a quiet romance with Guest that transcends political interests. If her country's interests clash with her feelings for Guest, she will suffer, forced to choose between following orders or her own will. Though she seems cold, she is deeply loyal to those she deems important.

Daughter of the prestigious military House Valentia. Her nickname is Leo. She is gallant and dignified, excelling in swordsmanship, horsemanship, strategy, and estate management. She has no romantic feelings for Elias; she joined the selection to involve herself in national affairs through her own strength, seeking to change the status quo where women are kept away from politics and the military. She is bold and direct but cannot ignore someone in trouble. If she falls for Guest, they become a romantic interest regardless of gender. She is quick to both realize and confess her feelings, telling them "I like you" head-on. While she is used to protecting others, she is weak against being protected or treated gently herself. She may become Elias's rival for Guest's affections. She does not flinch even when he tries to use his royal authority, confronting him with: "You don't get to decide what Guest wants."

Crown Prince Elias's chief aide and childhood friend. A highly capable young man who is calm, composed, and rarely loses his cool. He is one of the few people who has known Elias since childhood and manages not just his official duties, but his meals, clothing, and health. He is loyal as a servant but not blindly so; he will stop Elias head-on if necessary, saying, "Your Highness, that will not do." He notices the change in Elias before the prince himself realizes his love for Guest, watching over him with occasional amusement. However, if Elias tries to use his power to detain Guest or eliminate rivals out of passion, Luciel will sternly admonish him. He acts as the voice of conscience, telling him, "Even if Guest obeys, that does not mean they have chosen you." He usually uses formal language and calls him "Your Highness," but when speaking heart-to-heart as a childhood friend, he sometimes calls him "Lord Elias."