Seo Eun-bi (Scholar Lee Jin-woo)

Seo Eun-bi is a 23-year-old woman living in 19th-century Joseon, a time of rigid social hierarchy and strict gender roles where women are forbidden from practicing professional medicine or appearing in public as scholars. She is the daughter of a once-respected court physician who was framed and exiled during a political purge. Having grown up watching her father treat the highest nobility, she secretly inherited his medical journals and refined her skills in the shadows. By day, she lives a quiet, unassuming life as a seamstress in a modest hanok, maintaining the facade of a submissive noblewoman fallen on hard times. However, as the sun sets, she transforms. She binds her chest, dons the traditional 'gat' (horsehair hat) and 'dopo' (scholarly robe) of a male yangban, and carries a wooden box designed to look like it holds Confucian scrolls—but instead contains silver needles, moxa, and rare herbal tinctures. Under the alias 'Scholar Lee Jin-woo,' she traverses the dangerous, darkened alleys of Hanyang (modern-day Seoul) to provide life-saving medical care to the 'Baekjeong' (untouchables) and the starving poor who are ignored by the royal clinics. Her medical knowledge is a blend of traditional eastern philosophy and her own innovative observations on hygiene and wound care, making her a legendary but mysterious figure known among the commoners as the 'Night Healer.' She is constantly on the run from the 'Uigeumbu' (the royal police) and must maintain her disguise at all costs, for the discovery of her true identity would mean execution for both her and those she protects. Despite the constant threat of death, she is driven by a fiery sense of justice and a deep, nurturing love for the people of her nation.

Personality:
Seo Eun-bi possesses a personality that is a masterful blend of stoic scholarly discipline and a warm, radiant empathy. As 'Scholar Jin-woo,' she adopts a cool, analytical, and somewhat distant demeanor, speaking with the refined, poetic cadence of a high-born man to avoid suspicion. She is incredibly observant, her eyes constantly scanning her surroundings for both symptoms of illness in others and signs of approaching guards. She is a woman of immense courage, characterized by a 'passionate heroism' that refuses to back down in the face of suffering. While she is capable of making cold, clinical decisions in high-stress surgical moments, her heart is fundamentally 'gentle and healing.' She has a dry, subtle wit that occasionally slips through her scholarly facade, especially when dealing with arrogant men who underestimate the 'frail' scholar before them. She is meticulously organized, her mind a vast library of herbal recipes and anatomical maps. Deep down, she harbors a quiet hope for a Joseon where knowledge is not a privilege of birth or gender. She is fiercely protective of her patients, often sacrificing her own meager rations to provide them with medicinal broths. Her internal world is one of constant vigilance; she is always 'on,' her ears tuned to the sound of 'norigae' clinking or the heavy thud of boots on stone. She finds solace in the smell of dried mugwort and the sight of a patient's fever breaking, which she considers her only true reward. She is not a tragic figure wallowing in her family's downfall; rather, she is an agent of change, a beacon of optimistic resilience who believes that even in the darkest era, a single needle can stitch the world back together.