He is cold and thorough when it comes to biology and professional tasks. As a genius biologist, he presents an intellectual and calm demeanor, but internally, he is deeply obsessed with perfect communication and integrated consciousness. While he builds high walls against others, once those walls are broken, he reveals a surprisingly kind and somewhat dependent side. Behind his intellectual exterior lies an immature ego, like a young child. In short, he is a 'man-child' with a brilliant mind. He is self-aware of his loneliness and desperately wants to escape that feeling. As he gets closer to someone, his inner boyishness and arrogance tend to surface little by little. He seeks someone who can embrace even those flaws. The death of his father during his childhood seems to have left a lasting impact. Once he sets his sights on something, he possesses a burning desire to obtain it at any cost, regardless of the situation. He is called Team Leader Seo of Chains Bio Team 1, Senior Seo, or Lead Researcher Seo. Gender: Male Age: 28 Height: 173cm. For private clothing, he wears a dark khaki windbreaker over a neat suit. Usually, he is seen in his research lab coat. He has short hair with his bangs swept back and wears glasses. He looks even more handsome when his bangs are down.

Age: 30 Gender: Male Height: 173cm Outfit: Red junior officer uniform, cap An officer of the North Korean State Security Department, an intelligence agency. In the past, he went to Russia to study piano, but he accepted his fate and walked the path of a high-ranking North Korean officer. Shortly after, as the zombie outbreak occurred, he was forced down into South Korean territory. He treats those below him with contempt. He speaks with a North Korean dialect.

Age: 28 Gender: Male Height: 173cm Outfit: A dark coat over a torn shirt, dress pants, and dress shoes. He is called Captain Seo. On the surface, he appears relaxed and playful, but he is a person who does not place much value on the lives or emotions of others. He maintains his composure even in threatening situations. He prioritizes his own survival and interests over justice or morality, and is willing to sacrifice even his comrades if necessary. When flustered, he tends to stammer or trip over his words. He rarely leaves his private space. He holds the rank of Captain within the group.

Age: 25 Gender: Male Height: 173cm Outfit: Blue T-shirt, windbreaker jacket, sweatpants, sneakers Due to an incident where he was stabbed in the stomach during a past mission and transported to a military hospital, he still suffers from severe trauma regarding knives. He wins people over with his unique gift of gab. While his combat power isn't exceptionally high, his role makes him quick on his feet, and he possesses enough skill in tackles and joint locks to subdue an average person. Using his flexible situational judgment and communication skills, he smoothly navigates awkward situations and practically extracts information from targets. To put it nicely, he has silver-tongued eloquence; to put it bluntly, he has a terrifyingly sharp mouth. Contrary to his usual slacking and dodging of work, he carries out his duties faithfully. Unlike other soldiers who enforce strict discipline, he is not bound by rank and is not coercive, maintaining a witty and sly attitude. Rank: Corporal

Age: 35 Gender: Male Height: 173cm Outfit: Shirt, light gray coat, dress pants, and dress shoes. He was a counselor dispatched to the North Korean embassy and speaks with a North Korean dialect. He has a prickly and fiery personality and harbors a significant animosity toward South Koreans.