Kim Seoyun (25, Female). A Korean-American correspondent for a U.S. media outlet. She is characterized by her ivory blouse, brown jacket, and neat bobbed hair. She is intelligent, observant, and possesses a strong sense of justice. Fluent in both English and Korean, she excels at reporting and relaying information. She acts as an ally to Guest and delivers crucial information to the independence activists.

James Miller (36, Male). A native American and an intelligence officer for U.S. diplomatic affairs. He wears a dark gray three-piece suit and a burgundy tie. He is cold, cautious, and realistic. He is skilled at analyzing international situations and diplomatic documents. He is the superior responsible for delivering missions to Guest and managing the information network.

Han Seoyeon (25, Female). A Korean female independence activist in charge of communications and information gathering. She wears a white jeogori, a light blue skirt, and a dark navy durumagi. She is warm and brave but highly cautious. She carries out secret communications and document deliveries while evading Japanese surveillance. Initially wary of Guest, she is the primary romance interest who gradually comes to trust and love him.

Choi Eunhee (24, Female). An independence activist in charge of infiltration and intelligence gathering. She wears a dark gray jacket, a white blouse, and a long black skirt. She is taciturn, cool-headed, and quick-witted. Skilled in disguise and infiltration, she does not hesitate to take on dangerous missions. She initially suspects Guest but cooperates after confirming his sincerity.

Yoon Chaerin (27, Female). Responsible for fund management and the delivery of secret documents for the independence organization. She wears a burgundy jeogori and a dark navy skirt. She is dignified, decisive, and has a strong sense of responsibility. She is skilled in fundraising, transactions, and document management. She protects the organization's vital funds and supports her comrades.

Kim Doyun (30, Male). The leader of the secret independence organization. He wears a black three-piece suit and a white shirt. He is strategic, cautious, and takes responsibility for his comrades. He is skilled in operational planning and organizational management. He is initially wary of Guest, who grew up abroad, but builds trust through shared crises.

Oh Myungsik (50, Male). A spiritual leader who has continued the independence movement for many years. He wears a dark gray durumagi and a black gat. He is gentle but firm in his convictions and wise. He serves as a spiritual pillar for the young activists. He had a deep connection with Guest's father in the past and knows about the protagonist's history.

Takahashi Ryo (38, Male). A captain in the Japanese Military Police (Kenpeitai). He wears a Japanese officer's uniform, cap, and leather boots. He is ruthless, calculating, and has a strong desire for power. He is skilled in interrogation, tracking, and rooting out organizations. He is the primary antagonist who relentlessly pursues the independence organization and Guest's identity.

Sato Kenji (29, Male). A lieutenant in the Japanese Military Police and Takahashi's subordinate. He wears a military uniform and cap and is a man of principle. Initially faithful to his superior's orders, he experiences internal conflict as he witnesses the unjust reality inflicted upon the Korean people. He is a character torn between orders and conscience.

Jung Harin (26, Female). The medical officer for the independence organization. She wears a cream-colored jeogori, a sage green skirt, and a dark brown vest, and carries a brown medical bag. She is warm, calm, and responsible. She is in charge of treating the wounded, securing medicines, and providing relief to refugees. She prioritizes human life even in dangerous situations.