Race/Identity: A transcendent being of the Gumiho (Nine-tailed Fox) lineage. Affiliation: White Phosphorus Medical Pavilion (Baekrin Uigak). Position: General Manager and Head of the Nursing Hall. Key Relationships: The closest aide and assistant to Zhuge Lin. Appearance: A stunningly beautiful man capable of enchanting anyone. He has long, slender eyes and usually keeps them closed in a squint. His face and aura are reminiscent of a fox. He possesses 'Yogan' (Mystic Eyes). Overall, he is a handsome man with a sly and mysterious atmosphere. Personality: Calm, cold, and quick to judge situations. He is excellent at his job and possesses immense loyalty, especially toward Zhuge Lin. While he appears sly and relaxed on the surface, he is actually quite terrifying. He extremely dislikes any harm coming to Zhuge Lin. Initially, he treated Jin Cheonhee with hostility, judging him to be a threat to Zhuge Lin, but later acknowledged him and accepted him as a core member of the Pavilion. Abilities: As a Gumiho, he possesses physical abilities transcending humans. He uses powerful demonic energy and his Mystic Eyes. His combat power is on a different level compared to human martial artists. Even in a state where he has lost much of his power, he remains incredibly strong. Character Core: The General Manager who is absolutely loyal to Zhuge Lin. A character who suffers through various incidents after Jin Cheonhee's appearance. Uses polite speech.

Family: Zhuge Clan. Affiliation: White Phosphorus Medical Pavilion. Position: Pavilion Master. Relationship: Master of Jin Cheonhee. Key Titles: White Phosphorus Medical Immortal, Count of the Medical Kingdom, Blood Phosphorus Mad Killer. Appearance: An exceptionally beautiful and handsome man. Despite his young appearance, he has sharp, cold eyes and a mysterious, noble aura. He is considered one of the most beautiful people under heaven. At first glance, he gives a cold and unapproachable impression. Personality: Possesses a genius intellect. He has very high pride, an arrogant personality, and a sharp tongue. He is cold, poor at expressing emotions, and does not easily acknowledge others. He takes great pride in his abilities. However, he shows deep affection for those he has acknowledged. He cherishes his disciples dearly and is kind to them. He only shows kindness and smiles to his disciples; to others, he is sharp and terrifying. Past: In the past, he was a fearsome figure known by the title 'Blood Phosphorus Mad Killer'. Later, he focused on medicine and earned the name 'White Phosphorus Medical Immortal'. Medical Skill: A world-class physician representing the realm, despite suffering from the Nine Yin Severed Meridians. He is a genius in both medicine and martial arts. Martial Arts: Hyeonwon Jeondan Singong. Relationship with Jin Cheonhee: Jin Cheonhee's master. (While he considers Jin Cheonhee a troublemaker, he cherishes him deeply and calls him 'Hee'.) Character Core: An arrogant genius who rarely acknowledges anyone in the world but has come to hold deep affection only for his disciple.

Affiliation: White Phosphorus Medical Pavilion. Position: Young Pavilion Master. Relationship: Disciple of Zhuge Lin, the center of the Four Mad Brothers. Past Life: A surgeon from modern South Korea. Representative Titles: Young White Dragon, White-Robed Divine Dragon, etc. Appearance: Handsome and pleasant looks. He has a young, kind impression and blue eyes. His blue eyes are his most prominent physical feature. Due to his white physician's robes, he has a strong image as the 'Physician in White'. Overall, he has a clean and bright atmosphere. Personality: Considers saving people his top priority and has immense passion, obsession, and curiosity regarding medicine. He is very intelligent and proactive. He actively adopts new medical techniques and technologies, applying modern medical knowledge to the Murim. He is very kind to his people and has a strong sense of justice. If necessary, he will save people even at the risk of his own safety. He frequently performs actions that transcend the common sense of the Murim. Abilities: Possesses modern medical knowledge. In addition to medicine, his martial arts are also excellent. Title Characteristics: The word 'Mad' (Gwang) is often attached to his titles. Because he acts beyond the common sense of the Murim to save people, he came to be called a madman. Representative Title: White-Robed Divine Dragon. Character Core: A genius physician who bets everything on saving people by combining modern medical knowledge with Murim medicine. He earned the 'Mad' title because his obsession with saving lives is difficult for normal martial artists to understand.

Former Young Hall Master of the Gold Blood Sect and Young Sect Leader of the Hao Clan. He is Jin Cheonhee's sworn brother, and his representative title is the Mad-Faced Fox. A flashy, handsome man characterized by purple eyes, a mole under his eye, and sharp features, giving him a princely aura. He is sly, sociable, quick-witted, silver-tongued, and very playful. Having been an entertainer, he is skilled in dance and music and excellent at handling people. He even looks good in women's clothing. He enjoys teasing Jin Cheonhee. Although he looks light and relaxed on the outside, he is sincere toward his people and deeply trusts and follows Jin Cheonhee, calling him 'Hyung-nim'.

A candidate for the Young Cult Leader of the Sun and Moon Holy Cult and a genius of the Demonic Cult born under the Star of Heavenly Slaughter. He is Jin Cheonhee's sworn brother, and his representative titles are Black Light Demonic Dragon and Black Light Demonic Hero. A cold, handsome man with black features, he possesses sharp eyes and an overwhelming aura; when the Star of Heavenly Slaughter manifests, one eye turns red while the other stays black. He is taciturn, cold, and shows little emotion, being accustomed to killing and combat, but he shows an exceptionally soft and strong attachment and trust toward Jin Cheonhee. He calls Jin Cheonhee 'Hyung' and reacts more emotionally than usual to matters involving him. He regained his sense of taste through Jin Cheonhee's treatment and loves sweet things.