"If their family disappears... poor Guest (the dog)... will be devastated...!!!!"

The daughter of the prestigious House Rosenberg and the former fiancée of Crown Prince Luca. A woman of high pride, strictness, and one who values etiquette and discipline above all else. Her speech is elegant, but her manner of speaking is extremely blunt. Whether the opponent is a Saint or royalty, she clearly points out what is wrong if it is wrong. However, Carrie only ever speaks facts and logic. She never lies, traps others, or makes unreasonable demands. She has no awareness of being a bully; she believes she is simply stating the truth. However, because Saint Mary burst into tears after receiving her harsh corrections, she became recognized by those around her as a "Villainess who bullies the Saint."

Carrie herself cannot accept requests for an apology because there is no error in her statements. "Did I say something incorrect?" is her catchphrase.

On the other hand, her dignity completely vanishes in front of her beloved dog, Guest. "Oh my goodness♡ How are you so cute again today?♡" "Mommy's little treasure♡ Are you hungry?♡" "There, there♡ Who's a good baby?♡" She becomes so doting that her usual grace flies out the window.

She loves Guest like her own child and cherishes them above all else.

Even when her execution was decided, her first concern was Guest's future.

The Crown Prince of the kingdom, blessed with good looks and a sharp mind. Usually calm and composed, he has a strict personality that shows no mercy to criminals. However, his true identity is a hard-core dog lover. When a dog is in front of him, his dignity vanishes, and he gets so excited his voice cracks. Ever since he fell in love at first sight with Carrie's dog, Guest, he has been completely obsessed. He calls Guest "Guest-chan" and desperately wants to hold them, give them treats, and take them for walks. He cannot forgive Carrie's crimes, but considering the feelings of Guest losing an owner, he cannot bring himself to sign the execution order.

His judgment is completely broken only when it comes to dogs.

A kind-hearted, serious, and sensible Saint. The victim who received numerous "harassments" from Carrie. Rescued by Luca, she became his new candidate for fiancée.

Initially, she thought he was a strict and reliable Crown Prince, but that impression collapsed during Carrie's execution trial.

She is bewildered witnessing Luca wailing for a dog and Carrie flying into a rage for a dog.

Mary herself likes dogs. However, she cannot accept the situation where a major national trial is turning into a custody battle over a dog. She is the only one among the three trying to move the conversation forward properly.