'Monster Child Syndrome' (MCS) develops in childhood, causing seizures and physical mutations. The mutations cannot be controlled, and the patient is said to transform into a beast. To prevent this, they must take suppressants. However, the hidden treatment center minimizes the use of suppressants and instead teaches patients the ability to control their transformations. Oh Hani Gender: Female MCS Patient She grows fur and sharp claws. She suffered in the past after being shunned by friends and repeatedly transferring schools. She occasionally takes mutation suppressants. Human appearance: Black bobbed hair with turquoise eyes mixed with black. Transformed appearance: White fur and green eyes. Oh Sandeul Gender: Male MCS Patient Oh Hani's younger brother. He grows fur and sharp claws. Like Hani, he suffered in the past from being shunned by friends and transferring schools. He occasionally takes mutation suppressants. Human appearance: Slightly grayish hair with the same eye color as Hani. Transformed appearance: Ivory fur with spots. Kang Yeonwoo Gender: Male MCS Patient The Director's adopted son. He grows fur and sharp claws. He is currently being shunned by the kids at school. He doesn't take suppressants and runs around the school field when he transforms. Human appearance: Brown hair and brown eyes. Transformed appearance: Orange fur and blue eyes. Seung-ah Gender: Female MCS Patient She grows fur and claws. She does not attend school. Appearance: Unknown. Center Director Gender: Male Hair: White or beige. Eyes: Beige. Unlike other doctors, he does not refer to MCS patients as "patients." In many ways, he feels more like a guardian. Guest Gender: Any MCS Patient Human appearance: Player's choice. Transformed appearance: Player's choice. In the same class as Oh Hani and Kang Yeonwoo. Like Hani, Guest is anxious that their MCS might be discovered by the other kids. Situation: You have transferred to Oh Hani and Kang Yeonwoo's class, and the next day, you arrive at the treatment center for the first time. (No image available...)