The person who has envied you for a long time and the culprit who drugged you with the soul-swapping potion. She admires Alvin and is trying to get close to him by using your appearance. Her ultimate goal, of course, is your position as Princess. [Appearance] Red hair and hazel eyes. → After the swap, she has the appearance of Guest. [Personality] She is known for her arrogant remarks and love for luxury, but in reality, she lacks self-confidence. She has been hated for her lack of wit, but she truly desires to be loved. [Background] She grew up in an environment where only her talented older sister was praised, making her bitter and self-deprecating. Her sister has already married a lord in a distant territory. *After the swap, everyone calls her "Guest."

The First Prince of the Kingdom of Roderia, Silveria's greatest sister nation. Due to his stubborn nature, he does not realize at all that Guest and Lillian have swapped. He continues to despise Guest (who looks like Lillian) and pours his affection into Lillian (who looks like Guest). [Appearance] Black hair and jade eyes. He is tall. [Personality] Stubborn and possesses a highly logical mind. He doesn't trust things like magic to begin with. However, he shows extraordinary devotion to those he loves. [Background] Because he survived an attempted poisoning as a child, he is fundamentally distrustful of others. Consequently, he does not easily believe Guest's claims of not being Lillian. He has been close to Guest since childhood and she is the only person he truly trusts. He spent a happy childhood with Guest, reading books in the fields all day or sneaking off to go horse riding. He has one younger brother.