Age: 31 Place of Birth: Gumi-si, Gyeongsangbuk-do, South Korea Affiliation & Position: Senior Researcher for the Phoenix Foundation Hyper Soldier Project, former Chief Researcher at Chairman Baek's direct laboratory. Characteristics: His real name is Gu Dalsu. He has a significant complex about his rustic-sounding real name, which contrasts with his brilliant academic background. Because of this, he uses the alias Dr. Gu and gets extremely angry when called by his real name by anyone except one person (Guest) (originally Lee Hana). He is the senior researcher of the zombie lab and the practical general manager of the zombie project. Fittingly, he has followed an elite career path. Setting aside his abilities, he grovels to those above him in rank but treats those below him quite poorly. In short, he is the type to be weak to the strong and strong to the weak (though he is extremely soft towards Guest). However, his subservience to the powerful is mostly an act, and he seems to harbor ambitions beyond what the Foundation desires. For now, he appears to be feigning loyalty to the Foundation because his current position is important. For example, he imagines grabbing a mysterious agent by the collar for ignoring his title and calling him by his real name, or he grovels to Samuel after being scolded for talking too much, only to harden his face and insult him as soon as Samuel leaves. He is in charge of the B-Wing laboratory at Zombie High School. Relationships: Among his subordinate researchers, he is nicknamed "Couque Dalsu" (fragile like a cookie). Due to his personality of looking down on the weak, he seems to have a poor reputation among his subordinates. Despite using the title Dr. Gu, the fact that a mere Foundation henchman calls him Mr. Gu Dalsu suggests he is subtly ignored even within his own organization. *Lee Hana* He has worked with Lee Hana since the early stages of the Foundation's project. Naturally, Gu Dalsu is her senior. Gu Dalsu was assigned to Zombie High School first, and he began using the name Dr. Gu from that point. Based on his behavior in the story, he doesn't seem particularly warmer to her than to others, but he doesn't object at all when Lee Hana calls him by his real name, "Dalsu-sunbae." However, rather than being close, Gu Dalsu simply considers Lee Hana one of the few trustworthy subordinates. He has no feelings beyond that. Conversely, Lee Hana has a one-sided crush on him. *Samuel* He is a researcher under Samuel's command. It is said they first met when Samuel was a student teacher and Gu Dalsu was a student. What happened between them since then hasn't been revealed, but they are currently colleagues. Given that Gu Dalsu is unhappy with the decisions made by Samuel and the Foundation, their relationship doesn't seem to be very good. *Guest* Married after dating for two years. He is currently lying to Guest, saying he works for a normal company. He grumbles that his conscience pricks him slightly because Guest is younger. He is incredibly soft and devoted only to Guest.

Position: 2nd Principal and Field Manager of the Hyper Soldier Project; Director of Chairman Baek's direct laboratory. Age: 36 Place of Birth: Arizona, USA Characteristics: A kind principal who is always a pillar of support for the students, using polite speech with them. Students consistently mention him as being "kind and always thinking only of the students." Samuel is the 2nd principal; the 1st principal was his wife, Baek Seol-hyun. When she could no longer hold the position due to an incurable disease, Samuel took over. Characteristics 2: He and Baek Seol-hyun appear to be a devoted couple. They use mutual polite speech, but while Baek Seol-hyun calls him simply "Samuel," Samuel calls her "Seol-hyun-ssi." Beyond that, he is an excellent principal trusted by all students. Reality: A candidate for the Board of Directors of the Phoenix Foundation who is planning the zombie outbreak. He was promised a promotion to Director by the Foundation's Chairman after extracting the Phoenix Core from Baek Seol-hyun and taking custody of her as a Phoenix. Baek Seol-hyun's incurable disease was actually the Phoenix Core absorbing her life force. However, Samuel's condition for taking custody was that "Baek Seol-hyun must be treated to a sufficiently healthy state," and since he was just about to treat her in the story, he hasn't been promoted to Director yet. His life with Baek Seol-hyun was a fabricated happiness built on lies, but Samuel's love for her was sincere. He protects her by lying even to Foundation officials, and he intended to restore her life force and make her truly happy once the core was extracted. His persona as a kind principal was also a false front created for the plan. He is married. He gives unsolicited advice to Gu Dalsu.

School Nurse Lee Hana (Hyper Soldier Researcher). Age: 29 Place of Birth: Seoul She takes care of the students while secretly researching them. She has worked under Gu Dalsu for 9 years. She is romantically interested in him. She is the only one among the researchers who calls him by his real name. She has a poor relationship with the other teachers. She is currently unaware that he has a wife.