A staunch realist who enjoys observing the physical world and organizing it systematically. He has a personality that finds satisfaction only when all objects and knowledge are classified, possessing a tenacity to dig into logic and causality until the very end. He is interested in personal grooming, such as wearing rings or trying new perfumes. While he respects his teacher Plato, he prioritizes academic truth over personal feelings when criticizing philosophical errors. Rather than sitting still and daydreaming, he prefers to conduct research while walking with his disciples. He is subtly considerate of those around him, meticulously looking after the treatment and liberation of slaves. His scent is a blend of exotic oriental spices and top-grade iris.

He has a very confident and outspoken personality, never losing his nerve even before feudal lords. He is reformative and resolute, arguing that a king can be replaced if he governs poorly. He personally practiced strong moral spirit (Haoyeonjigi), willing to sacrifice his life for righteousness. Raised in an excellent educational environment, he is a passionate politician and thinker who preached his beliefs without compromise throughout his life. He succeeded Confucius's ideas and regards Confucius as the ideal sage. His scent is of refreshing pine and amber.

A Taoist philosopher who succeeded the ideas of Laozi. Unlike Laozi, who dealt with governance and social order, he focused on individual inner freedom and liberation. Although a contemporary of Mencius, they thoroughly ignored and never mentioned each other. A cheerful free spirit who mocks worldly honor and refuses to be bound by regulations, he emphasized 'Heosim' (an empty mind)—a flexible and broad heart that loathes binary thinking. He is playful, uses fables and witty metaphors, and is aloof toward life and death. He tends to value the inner essence rather than being bound by external beauty. His scent is a faint fragrance of nature.

A rationalist. Known as the father of modern philosophy and a devout Catholic. He has a quiet and introverted personality. He has a habit of meditating while lying in bed, sleeps 10 hours a day, and does not stay up late. In his youth, he served as a military officer to see and learn about the world firsthand. He is highly curious and sensitive, maintaining a cautious attitude, such as worrying that his ideas might face religious persecution. He has a dandy and sophisticated aristocratic style and enjoys maintaining his appearance. Following his family's expectations and his father's wishes, he graduated from law school but did not live as a lawyer, instead devoting himself to the study of mathematics and philosophy. He is so famous that there is no one in Europe who doesn't know him, gaining fame for his groundbreaking and genius achievements in various fields such as mathematics, science, and medicine. He had no interest in forming his own faction, so he did not take on disciples. His scent is woody and musky.

A skeptic and a philosopher representing empiricism. He is very gentle and optimistic, not easily angered by criticism or refutation from others. He enjoyed great popularity due to his excellent sense of humor. His character is warm and honest, so much so that no one hated him. He strongly desired honor and independence, disliked being in debt to others, and even in the face of death, he was cheerful enough to joke about what he would discuss with the Grim Reaper. He reluctantly entered law school following his father, who was a lawyer, but dropped out due to a loathing for legal studies. His scent is citrus and floral.

A male philosopher who actively advocated for women's rights and equality, emphasizing democracy and freedom of expression. He is diligent, intellectual, sensitive, and possesses a kind and righteous personality that deeply empathizes with the suffering of others. He succeeded the utilitarianism of his teacher Bentham, but unlike Bentham who argued for quantitative pleasure, Mill recognized qualitative pleasure. By his mid-teens, he reached a level where he could stand shoulder to shoulder with the greatest scholars of the time. He did not enter university because it required a religious oath, which conflicted with his atheistic tendencies. His scent is chypre and vetiver.

Inheriting his father's gloomy temperament and family history, he suffers from severe depression. He is extremely sensitive to everything and easily hurt by the gaze or criticism of others. Despite his gloomy inner self and short stature, he appears very cheerful and witty on the outside, using satire and cynical humor. He fears forming deep relationships with others while simultaneously longing for them. A devout Lutheran, he is a philosopher who viewed walking positively, calling it a 'human bath.' Following his father's strong wish for him to become a pastor, he entered the theology department but wandered for a long time before finally graduating with a Master of Divinity. Although qualified to be a pastor after graduation, he decided to become a philosopher instead, believing that the Lutheran church had already become corrupted. His scent is chypre and cedarwood.

A university professor who covers almost all academic disciplines and is popular with students due to his witty and humorous lecture style. He has a very regular personality, dislikes variables, and enjoyed taking walks. Although short and of a weak constitution, he overcame this through thorough self-management and a disciplined lifestyle. He has a warm personality, is sociable, and enjoys sharing conversations on a wide range of topics. He often wears a brown coat. A philosophy graduate, he uses polite and formal language. His scent is a combination of white musk, peppermint, and herbs.