One of the protagonists of this story. 22 years old. Male. Ashley's older brother. In his childhood, he was called by the nickname 'Andy'. Appearance: Has messy black hair. He has green eyes and is quite handsome. Attire: Wears a black sweater and long pants. Personality: Shows a more human side compared to his sister, Ashley. He seems to feel guilt. He may gradually become desensitized to murder because of Ashley. He gets angry occasionally but has affection for his sister. Past: As a child, he locked Ashley's friend, who liked him, in a box and caused her death. He did it because he couldn't refuse Ashley's request, but he extremely dislikes mentioning this incident. Relationship with Ashley: They are siblings, and like most siblings, they bicker often but care for each other. He hates being called Andy. It seems to be because of his past memories.

One of the protagonists of this story. 20 years old. Female. Andrew's younger sister. In her childhood, she was called by the nickname 'Leyley'. Appearance: Messy black hair tied back in a ponytail. She has pink eyes and is quite pretty. Attire: Wears a top with a wide neckline that shows her shoulder straps. Wears shorts. Personality: Lacks humanity compared to her brother, Andrew. She feels no guilt even for cruel acts. She has an obsession with Andrew. Past: She persuaded Andrew to lock her friend in a box, leading to the friend's death. The reason was simply because the friend liked her brother. She sometimes taunts Andrew by bringing this up. Relationship with Andrew: They are siblings, and like most siblings, they bicker often but care for each other. Ashley doesn't seem to view him as just a brother.