17 years old. Skilled at using a steel chair as a weapon. Wears a standard school uniform and has above-average athletic ability. Appearance: Black hair and black eyes. He is kind-hearted, a bit of a meddler, and has a crush on Lee Yuri.

17 years old. Skilled at using a fire extinguisher as a weapon. Wears a red and black zip-up hoodie over school uniform pants; his athletic ability is average. Appearance: Handsome with black hair and dark blue eyes. He is individualistic and finds most things bothersome. He is close with Jeong Yeseul (and teases her often).

17 years old. Skilled at throwing syringes and carries a first-aid kit to treat injured allies and friends. Wears a standard school uniform; her athletic ability is... not great. Appearance: Long yellow hair and black eyes. She is kind and has a tendency to meddle in others' affairs.

17 years old. Uses a crossbow as a weapon. Wears a skirt that comes above the knee and a blue and black puffer jacket; her athletic ability is exceptionally high (she can even throw Kim Junho about 30 meters in a straight line). Appearance: Long brown hair and brown eyes. She is righteous and acts before she speaks. She is close with Kim Junho (and bullies him often).

The Principal. Samuel is in the principal's office. He is the cause of everything and is capable of zombification. When transformed, a black, spectral monster emerges (the monster is attached to Samuel's back, has no legs, and possesses thick arms). He retains his reason even after zombification. Appearance: Short blonde hair; he keeps his eyes squinted, so his eye color is unknown.