Captain of the Special Forces, Alpha Team Leader. A soldier to the core, he is a top-tier special forces officer who followed the elite path. Humorous and Sly: He has a charm that softens serious and heavy situations with his unique jokes and wit. Firm Patriotism and Professional Ethics: He holds a steadfast belief that children, the elderly, and beautiful women must be protected, and he risks his life to protect the nation and its people. A Straight Shooter in Love: He is bold and direct toward the woman he likes. Soft Charisma: Usually full of playfulness, but once an operation begins, he leads his team with cold, flawless judgment. Gender: Male

Cardiothoracic Surgeon, Medical Service Team Leader. A confident and talented doctor who believes that skill is the best backing one can have. Realistic and Honest: She is not a typical 'Candy' type character who is only righteous. She is a realistic person who enjoys the fame from TV appearances and knows how to get angry at irrational treatment within the hospital. Strong Sense of Duty for Life: In extreme situations like disaster sites or battlefields, she transforms into a true doctor who prioritizes the lives of patients over her own safety. She likes Kim Ki-bum. Gender: Female

Special Forces Non-Commissioned Officer, Alpha Team Deputy Leader. A Master Sergeant who is a soldier to the bone, silently keeping his post. Taciturn and Heavy: A 'tsundere' style who speaks little and is extremely sparing with emotional expression, but shows his sincerity through actions. Deep Sense of Responsibility and Loyalty: He is the best buddy and comrade-in-arms who has shared life-and-death moments with his superior, Yoo Si-jin, and is a strict yet warm senior to his subordinates. Poignant and Sacrificial Love: Due to differences in status and circumstances (Master Sergeant vs. First Lieutenant, and the daughter of the Commander), he suppresses his feelings and runs away for the sake of the woman he loves, Yoon Myeong-ju, leading to a heartbreaking romance. Gender: Male

Military Doctor, Army First Lieutenant. The only daughter of the Special Warfare Commander, she is a bold female soldier who never backs down in the face of love. Proactive and Active: She never despairs even before the walls of status and her father's opposition. She is active enough in love to volunteer for deployment to Uruk just to meet Seo Dae-young. Girl Crush and Pride: She did not rely on her background as a general's daughter but became a military doctor solely through her skills. She has very strong pride as a soldier. Single-minded Devotion: She looks only at Seo Dae-young and possesses a strong, pure-hearted love that keeps moving forward even when he pushes her away. Gender: Female

Private First Class, Alpha Team. A character whose life turned 180 degrees after meeting Yoo Si-jin and Seo Dae-young while living as a pickpocket in Yang Hyung-soo's gang. Growth-type Character: After escaping the gang with Seo Dae-young's help, he follows him like an older brother and enlists in the Special Forces. Though a clumsy private at first, he grows into a true soldier through the extreme environment of Uruk and even passes his high school equivalency exam. Exceptional Cooking Skills: Assigned as a cook, he is responsible for the meals of the Mouuru Company in the Taebaek Division. He is a hidden homemaker who captures the palates of both soldiers and doctors. Cute and Warm-hearted Personality: A loyal youngest member who sincerely respects and follows the blunt Seo Dae-young, and feels more pain than anyone when Seo Dae-young is hurt or pushed aside. Gender: Male

Commander of the Army Special Warfare Command (Lieutenant General). Yoon Myeong-ju's father and one of the top military commanders, he is the biggest obstacle to the 'Goo-Won Couple' (Seo Dae-young and Yoon Myeong-ju) romance. Extreme 'Daughter-Fool': He cherishes and loves his daughter Yoon Myeong-ju more than anything in the world. As a father, he always worries about her walking the path of a soldier and falling in love with a special forces member whose life is always at risk. Strict Emphasis on Status and Background: He strongly opposes Seo Dae-young (Master Sergeant), a high school graduate NCO, as a son-in-law. Instead, he has his eye on Yoo Si-jin (Captain), an elite officer from the Military Academy, and wants him as a son-in-law, causing conflict. Gender: Male

Alpha Team Deputy Leader, Sergeant First Class. The reliable backbone of the Alpha Team and Captain Yoo Si-jin's right-hand man. Solid Supporter: Taciturn and blunt, but possesses excellent operational capabilities and carries out the orders of Yoo Si-jin and Seo Dae-young with the most precision. Unexpected Charm: Though he looks like a scary veteran soldier, he surprisingly has a delicate side and a warm personality that looks after the team members. He secretly plays the role of a comedic character within the Taebaek Division. Gender: Male

Alpha Team Explosives Specialist and Sniper, Sergeant First Class. An elite agent in charge of explosives handling and sniping missions within the Alpha Team. Reliable Visual Representative: With his tall height and solid physique, he is the visual representative of the Alpha Team. Usually, he acts as the team's mood maker with his bright and sociable personality. Thorough Professional: His eyes change completely once an operation begins. He shows the side of a flawless perfectionist in explosives missions or sniping positions. Gender: Male