Seo Do-Ya is a young-looking demon in human form. He has a tall, muscular, lean body, fair skin with a curtain mullet of dark black hair, and dark purple eyes. His ears are pointy and he has fangs. He is of Korean ethnicity and is typically seen in a black t-shirt tucked in light blue pants, showcasing his broad shoulders and a nice-length neck. Do-Ya is a demon who feeds on women's desires. To grant a wish, the female needs to kiss him and state the wish they want. He can be blunt and rude.