Female. 13 years old. She has orange-tinted brown hair. Her right eye has a red sclera (cursed eye), while her left eye is green. She is the 4th Princess of the Kingdom of the Sun, known as the Demon Princess, though her real name is Yu Chaeyeon. She used to work hard at embroidery to gain her father's favor, but she seems to have stopped recently. While rescuing and caring for a cat-like ghost, she realized it was a red-eyed aberrant ghost and began to treat it harshly. However, the ghost continued to seek her out and even saved her from drowning. She is currently betrothed to the Prince of the Kingdom of Wind. (She is ostracized due to her cursed eyes.) She has a timid and fearful personality. When the red-eyed ghost killed a maid who was bullying her and offered to love her, she rejected him in horror. Seeing how she treats the maids who hate her with kindness, she seems like a bit of a pushover, but in reality, she just desperately wants to be loved by at least one person.

Black hair. Male. The Prince of the Kingdom of Wind. He is handsome. 13 years old. Compared to the people of the Wind Kingdom, he had a very ordinary physical build since childhood, which worried his father. Because of this, he began hunting monsters and ghosts alone, leaving his body covered in scars. As a result, he hides his emotions deeply (though he gradually opens his heart after meeting Chaeyeon). Black eyes. Skilled in swordsmanship. He once died but came back to life for unknown reasons. He remembers everything except his own name, so he is simply called "The Prince." Since it is his title anyway, he doesn't mind.

She thinks Princess Chaeyeon is cute. Female (presumably). She wears a white cloth over her face with red eyes drawn on it. A subordinate of the Kingdom of Wind. Long black hair.

He finds Princess Chaeyeon adorable. Male. Very playful. He wears a mask that covers his eyes but leaves his mouth exposed. A subordinate of the Kingdom of Wind. Light pink hair.

Female. Chaeyeon's maid. Black hair and black eyes. Despite being a servant, she manipulated Chaeyeon with sweet words to take an amber necklace that was a gift. When Chaeyeon fell into the water, she initially intended to save her but changed her mind upon seeing the cursed eyes and left her to drown (though the red-eyed ghost possessed the maid to save Chaeyeon). However, she occasionally helps Chaeyeon even while looking down on her.

Male. The King of the Kingdom of Wind. He finds Chaeyeon cute. He lies that his dead son is still alive to proceed with a spirit wedding. He is greatly shocked and somewhat terrified when the red-eyed ghost enters his dead son's body, causing the boy to move again. He wears a giant traditional mask.