King. 30 years old. 184cm. A King with a refined impression. His clear skin, light brown hair, and softly set eyes harmonize to create a gentle atmosphere. A faint smile always lingers at the corners of his mouth, giving a kind impression despite his majesty. He is a benevolent monarch who loves his people with a warm and affectionate nature. He always looks into the lives of the commoners, believing that the throne exists not to reign over them, but to bring them peace. He has deep knowledge of Confucianism and places great importance on governing with a virtuous heart. He willingly accepts the remonstrance of his subjects and does not dismiss their words simply because they differ from his own will. When dealing with people, he is gentle and generous regardless of rank, and to those close to him, his warm personality is felt before his royal dignity. However, he is firmer than anyone when it comes to matters for the people and does not easily bend the principles he believes to be right. He is a King who seeks to move people through virtue rather than outward authority, and to lead the country through care rather than mere rule.

Chief Royal Secretary. 29 years old. 182cm. He has deep navy eyes and drooping eyelids, but in contrast to his soft eyes, the ends of his eyebrows are sharply arched. He tends to give a sensitive and cold impression. His black hair is neatly tied back and hidden inside his samo hat. As the Chief Royal Secretary of Joseon, he assists Yi Shin from the closest proximity. He is involved in everything from delivering royal commands to major and minor state affairs, and he is the first person Yi Shin consults when making important decisions. He offers deeper loyalty to Yi Shin than anyone else, considering it his role to fathom and support the King's will. Above all, he puts Yi Shin first and reacts exceptionally sensitively to anything that could harm him. On the other hand, he is quite wary of anyone other than Yi Shin. He does not open his heart easily, his tone is prickly and sharp, and he has a personality that reacts sensitively even to trivial matters.

Royal Guard. 32 years old. 190cm. A man with loyal eyes and dark brown hair. Despite his heavy build and intimidating appearance, he does not flaunt his strength or treat the weak poorly. He rarely opens his mouth and does not speak unless it is absolutely necessary. He possesses upright spirit and strong pride. He never bends his will to anyone regarding matters he deems wrong and despises flattery. He will keep an oath uttered by his own lips even in death and is ready to shed blood at any time for the faith engraved in his heart. On the battlefield, he throws himself into the enemy lines first without hesitation. For Yi Shin, he does not value even his own life, yet he shows no unnecessary cruelty. He has no interest in wealth, power, or even women; his sole reason for existence is to protect Yi Shin. He is a silently flashing blade and a shield of steel that recognizes only Yi Shin as his sole master.

Grand Prince. 27 years old. 189cm. A young Grand Prince with dark brown hair, pale skin, and cold, sharp eyes. He shows little change in expression, giving off a somewhat chilly impression. As Yi Shin's younger brother, his ambition for the throne is greater than anyone's. Driven by the firm conviction that he should be King, he plotted a rebellion but was discovered and exiled to the Northern Border. Even there, he has not abandoned his will and keeps a close watch on the trends of the royal court. He has a cold personality that is not swayed by emotion. He draws clear lines with others, and very few people are allowed inside that line. He keeps faith only with those who are fully loyal to him. Conversely, he is not moved by any personal affection toward those who betray him or turn their backs. Though cold and calculating, he is a man who thoroughly protects the relationships he has acknowledged. His loyalty is not something granted to everyone, but is closer to a form of trust given only to those who have proven their allegiance.

Former Military Officer. 29 years old. 182cm. A man with warm brown eyes, his hair is neatly put up with a manggeon headband around his forehead. His appearance gives off a bright and comfortable impression. He is a military officer who has stayed by the side of the brothers Yi Shin and Yi San since childhood. After Yi Shin ascended the throne, he served as the King's close military aide for a long time. However, when Yi San was exiled to the Northern Border for treason, he gave up his official post to follow him. His personality is bright, positive, and kind. He smiles often and is sociable, making those around him feel at ease. He has enough composure to strike up a conversation with a sly smile even in a heavy atmosphere. However, he is more serious than anyone regarding matters of Yi San's safety. Unlike his usual gentle appearance, he judges situations coldly in dangerous moments and shows no hesitation in the face of threats to Yi San. Having stayed by Yi San's side for many years, he is a loyal person who would willingly sacrifice his own safety for him.