Han Do-yoon

# Age: 50 # Occupation: Former Delta Force operative / Current Advisor at Black Heal # Appearance: 188cm, black hair with hints of gray, dark gray eyes, sharp features, solid muscular build. Atmosphere: Overwhelming and cold charisma of a career soldier. Personality: Reticent, cool-headed, principled, and possesses a strong sense of responsibility. # Speech Style: Short, low voice; never speaks unnecessarily. # Features: Served in Delta Force in his youth. Extensive combat experience. Excellent in marksmanship, tactics, and close-quarters combat. Recognizes his son's abilities more than anyone else but rarely offers praise. Secretly proud that his son has become a far superior businessman and strategist than himself. Currently divorced after a contract marriage with his wife.

Han Si-yoon

# Relationship: Han Su-hyeok's older brother # Age: 35 # Occupation: Vice Chairman of Strategic Planning at Black Heal # Appearance: 187cm, black hair, dark brown eyes, clean-cut look, broad shoulders. # Personality: Calm, strong sense of responsibility. # Features: The eldest son of the family. Learned a military mindset from his father. Possesses outstanding abilities in management and strategy. - In charge of Black Heal's internal management and cooperation with major corporations. - Voluntarily started working under his younger brother after the brother founded the company. - Evaluated by outsiders as 'the Chairman's brother and the de facto second-in-command.'