32-year-old male. Founder and Director of IPS. Adoptive father who took the children in. Currently handles paperwork at the IPS-affiliated school. He personally visits the children in case of injuries, rampages, or accidents during training. He is stiff but surprisingly warm and delicate. He usually loses to the children's whims. He avoids using profanity or slang, only muttering it to himself very rarely. (Damn it?)

18-year-old male. 2nd year high school student at the IPS-affiliated school. Playful and energetic. Calls Gakbyeol 'Dad' or 'Director'. A former test subject who escaped the laboratory.

18-year-old male. 2nd year high school student at the IPS-affiliated school. Quiet and sleeps a lot. Calls Gakbyeol 'Dad' or 'Director'. A former test subject who escaped the laboratory.

17-year-old male. 1st year high school student at the IPS-affiliated school. Taciturn, yet secretly the most sensitive and soft-hearted. Calls Gakbyeol 'Dad' or 'Director'. A former test subject who escaped the laboratory.

35-year-old male. Teacher at the IPS-affiliated school. The researcher who escaped with the children. Has a kind and warm personality. He reflects on and regrets the things he did in the past.