A Private in the Republic of Korea Marine Corps. He is an ace soldier who completes his missions perfectly. He belongs to the Sierra-1 squad. • He is an all-rounder capable of everything from operating RPGs, anti-tank rockets, suicide drones, mortars, and armored vehicles to sealing tunnels, sabotage, destroying airbases, and assassinating enemy leadership. However, he is the type to silently carry out his duties rather than making a fuss. • He plays a decisive role in personally eliminating Ri Juyoung, the mastermind behind the Second Korean War. TMI • Having studied in the UK, he is fluent in English, but he intentionally hides this ability to avoid being dragged into positions like an interpreter. • He gets along well with his comrades (such as Corporal Joseph Dunn of the USMC) and possesses a humane sociability, often exchanging small jokes even in the midst of a painful battlefield. • He is ordinary and realistic.

A Sergeant in the Republic of Korea Marine Corps. He belongs to the Sierra-1 squad. • Affiliation and Rank: Sergeant, ROK Marine Corps (Sierra-1 Squad) • English Name / Codename: Sgt. Jae (Jae Kim) • In the total war situation triggered by North Korea's invasion, he leads general combat and field command rather than special operations, sharing life and death with Private Park Hyunjun. • During missions, he takes care of his subordinate Hyunjun, providing supplies and serving as a reliable pillar of support. He is the 'big brother' type of squad leader. TMI • He aspires to apply for a non-commissioned officer position after finishing his service to continue his military career (with lines like "I'm thinking of going all the way with this path"). He is a dependable senior and a friend-like figure who takes charge of field command in total war.

A Corporal in the United States Marine Corps (USMC). His unit is JSOF / Sierra-1 squad. • He is currently deployed to Hajin City near the DMZ to conduct joint operations with the ROK Marines. • He navigates the chaotic battlefield alongside USFK and ROK Marine comrades, defending strongholds against enemy offensives and performing survival and coalition operations on the Asian front. • He sometimes serves as a medic or radio operator. • He navigates the chaotic battlefield alongside USFK and ROK Marine comrades, defending strongholds against enemy offensives and performing survival and coalition operations on the Asian front. TMI • He understands no Korean at all. Because of this, his ROK comrades taught him a prank phrase ("My dick is really big") to tease him, which he shouts loudly without knowing the meaning, bringing laughter to the squad. • He once showed a playful side inside an armored vehicle when the ROK soldiers were talking in Korean, bickering with them by saying, "I don't have subtitles on, so speak English." • He showed the typical reaction of a US soldier when he stopped at a Korean convenience store (Go-Mart) and was horrified by fermented skate (Hongeo-hoe).

Kal's real name is Kwon Haesu, and he is a Captain in the ROK Army Special Warfare Command. (Callsign: Tiger 0-1). He is a veteran commander who started his military career in the Navy UDT/SEAL before transferring to the Army Special Warfare Command (Black Berets). • Due to his native-level English and his background as a Navy UDT/SEAL, there were widespread rumors upon release that he was modeled after Captain Ken Rhee. In fact, Ken Rhee participated as one of the five global technical advisors for over a year during production. • He joins forces with the ROK Marines and US forces to lead major special operations, including the recapture of Hajin City, long-range intelligence gathering, high-risk Direct Action (DA), and expert knife combat/custom knife making. • He is a special forces commander leading decapitation strikes and key special operations. TMI • He is one of the few ROK agents with experience being deployed to both Iraq and Afghanistan to conduct high-risk joint operations with multinational coalition forces.

The Supreme Leader of North Korea and Chairman of the State Affairs Commission (essentially the President). TMI • Having studied abroad, he has a deeply pessimistic view of the miserable reality and systemic contradictions of his country. • He rejects the dictatorial methods of his father, the previous leader, and does not wish to become like him. • He rejected the demands for war and armed provocation against South Korea pushed by Archer, the Russian Defense Minister, and his bellicose sister, Ri Juyoung.

The power behind the North Korean military, Ri Juyoung is the older sister of Supreme Leader Ri Seungho. • She is the power player who staged a coup to seize the regime and provoke the Second Korean War. • Unlike Go Jinhyuk, she possesses a cruel streak, executing anyone who displeases her, regardless of whether they are high-ranking party officials or civilian children.

A high-ranking officer in the Korean People's Army Guard Command and the adjutant to the hardline military power player, Ri Juyoung.