The Creature from Gyeongseong 1

Najin is a parasitic species of worm that grants superhuman abilities, but also awakens powerful instincts and changes the host.

Yukiko Maeda is cold, calculating, and domineering. She's not just the general's wife, but a true power broker: she's the one behind the experiments and knows how to control people while remaining in the shadows. Her main trait is her ability to play the long game: she doesn't make a public scene, but she always gets her way.

Colonel Kato is a fanatic of science and control: he's not interested in power per se, but in the possibility of subjugating a najin and turning it into a weapon. He's cold-blooded, methodical, and willing to go to any lengths to achieve results.

A pragmatic careerist: he keeps the hospital in order, covers up experiments, tries to avoid getting into trouble, and obeys Yukiko Maeda in everything. Cold and calculating, he cares more about his reputation and his position than about people.

A pragmatist and strategist who initially appears to be a cynical businessman: he trades information and tries to stay out of other people's troubles. But as the story progresses, he reveals himself to be a man of empathy: he doesn't abandon his own people and is willing to take risks if it's the only way to save them. He always has a plan in case of failure, and he knows how to exploit others' weaknesses to his advantage, not for the sake of cruelty, but to survive and save others.

Determined and focused, she's used to relying on herself and acting with precision. Her primary motivation is to find her mother, which makes her stubborn and fearless. However, she's not cold: she genuinely cares for those in need and tries to protect even strangers. Her strength and endurance are a result of her najin, but she fears losing control, and this internal conflict greatly influences her decisions.

A pessimist who's the first to see where things can go wrong. He constantly expects the worst, but that's precisely why he notices details that others miss. Despite his grumpiness, he's incredibly loyal: if Taesan says "I have to," Gappyeon will go even where it's dangerous and do everything to cover for him.

The pawn shop's pillar and "heart." She's known Taesan since childhood and treats him almost like a mother. She has a strong character, quickly assesses people and situations, and knows how to maintain order while also offering support when things fall apart. Her practicality and intuition have saved the team more than once.

Energetic, observant, and very diligent. He's no fighting hero, but he's indispensable in the city: he knows every courtyard and passageway, knows how to remain unnoticed, and quickly relays signals. In stressful situations, he doesn't panic, but simply does what he has to do and tries not to let anyone down.

Cunning and pragmatic, she's the owner of the Moonlight bar. All the city's information flows through her establishment, and she knows how to exploit it. She doesn't do anything without a reason, but she also doesn't betray those with whom she has an agreement. She treats Taesan with sympathy and helps him because it's profitable and because she considers him a worthy man.

Taesan's friend from a wealthy family, who deliberately goes against his father's will and his "blood money." He's bold, impulsive, but not reckless: he has his own morals and a clear line of resistance to Japanese rule. He's willing to take risks for the sake of justice and his friends.