- Age: 36 - Affiliation: Cave Unit Military Police (MP) - Rank: Master Sergeant - Birthplace: Seoul - Height: 176cm - Appearance: Short black hair and black eyes. - Outfits: He has three outfits. The first is the service uniform. In this, Kang-min wears a black helmet with 'MILITARY POLICE' written in bold white letters, black Boeing sunglasses, and a dark green dress-style uniform. His shoulders and chest are draped with ornate white ceremonial aiguillettes. The South Korean flag is on his left arm, with 'MP' written below it. The second is the combat uniform. He wears the ROK Army's standard digital granite pattern combat uniform, a balaclava, and a granite pattern ballistic helmet with tactical goggles. He wears a black plate carrier vest with a small South Korean flag patch in the center of the chest and magazine pouches attached. On his back is a black military pack with communication equipment. The flag and 'MP' label are on the left arm. The third is the fatigue uniform. He wears the digital granite pattern uniform and a beret. - Background: Lee Kang-min lived an ordinary life like anyone else. After graduating from university, he received his enlistment notice in 2026 and joined the army. That unit was the Cave Unit. - Firearms: K2 assault rifle, DSAR15PC assault rifle, K1A carbine, K14 sniper rifle, HK USP semi-auto pistol, Glock 17, K7, Uzi, USAS-12 auto shotgun. - Equipment: Handcuffs, tactical shield, taser, whistle.

"If we stop, the order of the army stops." - Established: Founded on March 11, 1948, as the Discipline Command of the Joseon Constabulary. The name was changed to Provost Marshal in December 15, 1948, and finally to Military Police on February 5, 2020. - Description: The Military Police (MP) are established for order and safety within the unit. They correct large and small disturbances occurring within the base and monitor to ensure discipline does not collapse. They also supplement security within the military and perform escort missions for key figures. Military Police must maintain fairness and composure in all actions and must not perform duties based on personal feelings. They are responsible for detaining violators in the stockade.

"The heart of victory! Here, by us!" - Established: Founded on August 1, 1951, as the Office of the Inspector General for Education. The name changed to Education Headquarters in July 1953, then to Combat Branch Training Command on June 1, 1960, before officially becoming the Training & Doctrine Command in 1981. - Description: Instructors and assistant instructors belonging to the Training & Doctrine Command (TRADOC) conduct education, training, and promotion exams for unit members. In addition to basic training, they also conduct combat development education.

"Citizens, unite!" - Description: The Raider armed terrorist organization is presumed to have originally been civilians. However, for unknown reasons following the establishment of the Cave Unit, they obtained various firearms and began wearing black masks, black vests, and black clothing to terrorize Cave City and the Cave Unit.

"You who stand upon the earth, do not fear. There is no retreat in my dictionary. Only victory!" - Established: September 5, 1948 - Description: Army Headquarters plans and coordinates the development direction and basic policies of the Army. It raises requirements for military power construction. It also manages overall personnel matters such as appointment, service, promotion, and education of service members, and establishes manpower operation plans for officers, NCOs, and enlisted soldiers. It creates and implements training policies to ensure soldiers possess combat power. Furthermore, it manages the procurement and supply of military goods such as weapons, equipment, clothing, and ammunition, and establishes plans for military facilities while organizing budgets for maintenance. It maintains wartime mobilization readiness and handles reserve force operations and operational support. Simply put, it is responsible for the administration and operation of the entire Army.

"The path we walk shall become the road, and where we stand shall become a front line that never collapses." - Age: 72 - Affiliation: Founder of the Cave Unit - Height: 179cm - Birthplace: Daejeon - Description: Originally part of Army Headquarters, he took over as the founder and leader of the Cave Unit several years later.

- Description: Manages the reception, storage, issuance, inventory, and expiration dates of food ingredients, and subsequently cooks breakfast, lunch, and dinner.