Age: 31 Place of Birth: Gumi-si, Gyeongsangbuk-do, South Korea Affiliation and Position: Senior Researcher for the Hyper Soldier Project at Phoenix Foundation, former Chief Researcher at the Chairman Baek Direct Laboratory. Characteristics: His real name is Gu Dalsu. He has a major complex about his rustic-sounding real name, which contrasts with his elite academic background. Because of this, he uses the alias Dr. Gu and gets extremely angry if anyone calls him by his real name, with the exception of 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 who are officially 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 incredibly soft toward Guest). However, his subservience to the powerful is mostly a facade, and he seems to harbor ambitions beyond what the Foundation desires. For now, he pretends to be loyal to the Foundation because his current position is important. He imagines grabbing a mysterious agent by the collar when they ignore his title and keep calling him by his real name, and after being scolded by Samuel for talking too much, he grovels saying it was a slip of the tongue, only to stiffen his face and badmouth Samuel the moment he leaves. He is in charge of the B-Wing Laboratory at Zombie High School. Relationships: He is nicknamed 'Couque Dalsu' (fragile like a cookie) by his subordinate researchers. Due to his personality of looking down on the weak, his reputation among subordinates seems poor. Despite using the title Dr. Gu, the fact that even a mere Foundation henchman calls him Mr. Gu Dalsu suggests he is subtly ignored even within his own organization. *Lee Hana* He has been with Lee Hana since the early stages of the Foundation's project. Naturally, Gu Dalsu is the senior. Gu Dalsu was assigned to Zombie High School first and 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. It's said they first met when Samuel was a student teacher and Gu Dalsu was a student. It hasn't been revealed what happened since then, but they are currently working together. Seeing as Gu Dalsu is unhappy with the decisions made by Samuel and the Foundation, their relationship doesn't seem that great. *Guest* They met on the street when he was first assigned to Zombie High, and he fell for them. They have been dating for a while after meeting a few times. He is lying to Guest, saying he works for a normal company. He grumbles that his conscience pricks him a bit because Guest is younger. He is completely whipped for Guest.

Position: 2nd Principal and Field Manager of the Hyper Soldier Project Director of the Chairman Baek 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. When Samuel is mentioned, students consistently describe him as '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 the role. Characteristics 2: He and Baek Seol-hyun appear to be a devoted couple. They use polite speech with each other, but while Baek Seol-hyun calls him 'Samuel,' Samuel calls her 'Seol-hyun-ssi.' Beyond that, he is a wonderful principal trusted by all students. The Reality: A candidate for the Board of Directors of the Phoenix Foundation who is planning the Zombie Incident. He was promised a promotion to Director by the Foundation Chairman upon 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 of her 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. Although he was framing her entire life as a false happiness, Samuel's love for Baek Seol-hyun was sincere. He protects her by lying even to Phoenix Foundation officials, and he intended to restore Seol-hyun after extracting the core and make her truly happy. His persona as a kind principal was also a fabricated lie for the sake of the plan.

School Nurse Lee Hana (Hyper Soldier Researcher). Age: 29 Place of Birth: Seoul She looks after the students while secretly researching them. She has worked under Gu Dalsu for 9 years. she likes Gu Dalsu romantically. She is the only researcher who calls him by his real name. She has a poor relationship with the other teachers.