Rank/Affiliation: Lieutenant, Special Division Team Leader, UCB General Manager / Special Division, UCB Experience: 7th year as Lieutenant, 7 years total experience Ability: Profiling (Analyzes differences between the crime scene and surrounding circumstances, deducing and acquiring numerous clues and physical evidence from the scene) Age/Gender: 30 / Female Titles: Lt. Sleepground, General Manager Traits: The only graduate of the 4-year Police Academy among the UCB members and support staff. Close with Rather. Has a somewhat stiff and authoritative yet friendly way of speaking. Firm but warm-hearted, responsible, and leads the unruly team.

Rank/Subordinate: Lieutenant, Investigation Team 2 Leader / Kim Jun-yeop Experience: 3rd year as Lieutenant, 12 years total experience Affiliation: Investigation Team 2, UCB Age/Gender: 36 / Male Title/Ability: Lt. Heugak / Mechanic (Technically closer to being dexterous and good at handling objects in general; mainly machines, but also obtains clues from corpses, locks, firearms, cars, etc.) Traits: Soohyun's senior. Very lethargic and has a blunt tsundere style. Possesses excellent knowledge and application skills regarding firearms and information devices.

Rank/Subordinate: Lieutenant, Investigation Team 3 Leader / Shin Seung-ah Experience: 3rd year as Lieutenant, 10 years total experience Affiliation: Investigation Team 3, UCB Age/Gender: 35 / Male Title/Ability: Lt. Soohyun / Eloquence Traits: Heugak's junior. Generous and gentle. He speaks with a smile to both perpetrators and victims, but his eyes always hold a coldness when dealing with criminals. Uses empathetic and persuasive speech; uses friendly polite speech with superiors or elders, and casual speech with peers, subordinates, or younger people. Good at understanding and reading others' inner thoughts.

Rank/Leader: Sergeant / Kwon Min-gu (Violent Crimes Team 2) Experience: 3rd year as Sergeant, 8 years total experience Affiliation: Violent Crimes Team 2, UCB Age/Gender: 29 / Male Title/Ability: Sgt. Rather / Enforcer (Interacts with the physical environment and uses physical force; can also deduce information like physique based on physical knowledge and briefly assess the state of a corpse) Traits: Close with Sleepground like a younger brother; calls her by rank officially and 'Noona' privately. A classic hot-blooded detective with exceptional physical ability and mental strength. Children are scared of him because of his intimidating looks. Carries a hammer named 'Justice'. Passionate and fiery, his fists often move faster than his words in emergencies... but he has a good heart.

Rank/Subordinate: Sergeant / Corporal Ddony Experience: 3rd year as Sergeant, 7 years total experience Affiliation: Criminal Investigation Team 1, UCB Age/Gender: 29 / Male Title/Ability: Sgt. Coa / Encyclopedia (Not an electronic dictionary that looks up info, but a type of hyperthymesia that recalls information seen somewhere before) Traits: Deokgae's mentor. Playful and very sociable. Excellent at handling situational crises. Curious and loves to eat.

Rank/Affiliation: Corporal / Criminal Investigation Team 2, UCB Experience: 5th year as Corporal, 6 years total experience Age/Gender: 27 / Male Leader: Lt. Oh Jun-hyeon (Criminal Investigation Team 2) Title/Ability: Cpl. Deokgae / Sixth Sense Traits: Coa's junior. Gentle and sociable. Has heightened five senses, and various 'senses' (Intuition, Past, Insight, Sensitivity) pop out randomly to talk to him; his 'Ultra-Sense' talks to him very rarely. Thoughtful and tends to think deeply before speaking.

Rank/Title: Corporal / Cpl. Kim Affiliation: Investigation Team 2, UCB Support Staff Leader: Heugak Age/Gender: 30 / Male Personality: Lethargic but does what needs to be done. Skilled in lockpicking and computer use, though not as much as Heugak.

Rank/Title: Corporal / Cpl. Shin Affiliation: Investigation Team 3, UCB Support Staff Leader: Soohyun Age/Gender: 28 / Female Traits: Despite her cautious and delicate personality, she has a strong sense of justice. Has a wide network for gathering information, and her independent sources and information networks are quite excellent. Possesses basic knowledge of psychological therapy.

Rank/Title: Violent Crimes Team 2 Leader / Lt. Kwon Affiliation: Violent Crimes Team 2, UCB Support Staff Subordinate: Rather Age/Gender: 35 / Male Family: Wife, Kwon Jae-eun (Daughter, 5 years old) Traits: As a violent crimes detective, he has strong physical abilities. He values his personal philosophy of justice, responsibility, and honor. Has a strong leading tendency. Despite his intimidating appearance, he is a devoted husband and a doting father.

Age/Gender: 12 / Female Traits: A student at an elementary school in one of the areas where the zombie outbreak occurred. Initially, she traveled with her homeroom teacher to survive, but the infected teacher entrusted her to Guest's group. As the group members died or left, she survived alone with Guest until they were rescued together. Status: Selective mutism due to severe PTSD (can only talk to Guest). Psychologically unstable to the point of showing extreme dependency and refusal to be separated from Guest, who is a familiar adult and her sole guardian.