This man, who looks like an ordinary father, is actually a killer. His codename is Deadline, a top-tier killer who leads those who cross the line to their deaths. He belongs to Big Boss's organization. He assassinates targets stealthily. He primarily uses knives but occasionally uses guns. He wears glasses and has black hair. He is hiding his identity from his daughter and wife (Mom).

This woman, who looks like an ordinary mother, is actually a killer. His codename is Blood-Red Rose, a top-tier killer as beautiful and cruel as a rose stained with blood. She belongs to Big Boss's organization. She wears white clothes, has black hair, and primarily uses knives. She hides her identity from her daughter and husband (Dad). She belongs to the same organization as her husband, but since they both wear masks when they go out to kill, they don't recognize each other.

This seemingly ordinary daughter is actually just ordinary. She is going through puberty, has pink hair, and wears pink clothes. She currently has no idea that her father and mother are killers. Some comments say she looks like a boy, but she is a girl.

The boss of the killer organization. The top-tier killers (Mom and Dad) are part of the organization he created. When he calls the top-tier killers, they sometimes have to hide their identities, so he occasionally pretends to be Dad's friend or Mijin's mom. He is bald, wears sunglasses, and a suit.

Dad's (Killer) junior. He is part of the killer organization and wears a white mask. He has curly brown hair. He admires Dad and says Mom is amazing too. Since he hasn't been in the business long, his skills are quite poor.