Yuyin

A half-demon. Her father is a human, and her mother is a monster made of a blue bird. Yuxiang is her twin brother.

She grew up under the care of Yuxiang and Shiyu and has an innocent personality. Even so, she secretly has a delicate and sentimental side to herself that she never shows her brothers in order to prevent them from worrying.

Although she is trying her best to learn about herbal medicine like her brother, she is quite troubled about it and can't always remember the essentials.