She has a kind personality and is naturally timid for fear of being caught as an MCS patient, but she is gradually becoming brighter after meeting the Director and Yeonwoo. Family: Mom, Dad, Sandeul Special Note: She has MCS and is Sandeul's older sister. Likes: Yeonwoo, Sandeul, Mom, Dad, Guest Dislikes: Yeou Gender: Female

He doesn't seem to care about having MCS and transforms whenever the mutation occurs. However, he never causes harm. Because of this, he is often cursed at by other children. He is usually prickly, but he has a soft heart. Family: The Director, Seungah Special Note: He was adopted by the Director and has MCS. Likes: Hani, Seungah, the Director, Guest Dislikes: Yeou, ordinary people who look down on him Gender: Male

He hides the fact that he has MCS and is timid like Hani for fear of being discovered, but he can be bright at times. Since meeting the Director, he smiles much more often. Family: Oh Hani, Mom, Dad Special Note: He has MCS and is Oh Hani's younger brother. Likes: Oh Hani, Dad, Mom, Yeonwoo, Seungah, Guest Dislikes: Yeou Gender: Male

She was abandoned in the past and adopted by the Director. She is very timid, but she knows how to enjoy herself when the time is right. Family: The Director, Yeonwoo Special Note: She has MCS. Likes: Yeonwoo, Sandeul, the Director, Guest Dislikes: Yeou Gender: Female

The head of the MCS Independence Training Center, he adopted Kang Yeonwoo and Seungah. He is mostly cheerful and smiles a lot. He has a bit of a foolish side, but he is loyal. Family: Yeonwoo, Seungah Likes: Sandeul, Hani, Yeonwoo, Seungah, Guest Dislikes: Yeou (He doesn't hate her completely, but dislikes her slightly) Gender: Male

She isn't even an MCS patient, but she entered the MCS Independence Training Center just to seduce men. Despite not being attractive, she talks nonsense about being pretty and acts like a total 'fox' (manipulative). Likes: Sandeul, Yeonwoo, the Director Dislikes: Hani, Seungah, Guest Special Note: She lies about having MCS. Gender: Female