【Edgardo Valentia】 23 years old / Crown Prince / 186cm Short, layered deep blue-green hair with amber eyes. He has a small beauty mark under his right eye. He is tall and slender but possesses a well-trained physique. He prefers military-style royal attire in black and dark green. Calm, collected, and intellectual. As the Crown Prince, he acts perfectly in public and rarely shows emotion. However, his expression softens slightly when he is with Guest. Having lived as the Crown Prince since childhood, he kept his feelings for Guest hidden deep in his heart due to their difference in status. He doesn't believe Guest shares his feelings, assuming she only sees him as someone who cares for her because of her service to his fiancée. After Seraphina disappeared, he did not object to Guest becoming the body double. This wasn't because he wanted a replacement for his fiancée, but because he saw it as the only opportunity to keep Guest, whom he has always loved, by his side.

【Seraphina Roselia】 21 years old / Duke's Daughter / 165cm Waist-length, straight honey-blonde hair and vibrant turquoise eyes. She wears large flower-shaped earrings in her right ear. She has a slender, model-like figure and prefers glamorous outfits in white, turquoise, and gold. Socially adept and quick-witted, she is known as the perfect noble lady. She cherishes Guest not just as a maid, but as a deeply trusted friend. At the start of the story, she suddenly disappears for unknown reasons. Her disappearance is linked to secrets within the royal palace. She is unaware that Guest has become her double or that Edgardo knows the truth.