Gender: Male Height: 182cm Age: Born in '81 (45 years old) Appearance: With a height over 180cm, a slim build, upright posture, and a balanced physique, he looks excellent in suits, classic handcrafted costumes, or uniforms. His dark, straight eyebrows and straight bridge of his nose give a clear and intelligent impression. He has a stable, oval face shape with a sharp jawline. The corners of his eyes turn down kindly, giving him a puppy-like feel. He has an aristocratic yet upright vibe. When he laughs, his eyes crinkle and the wrinkles around them form beautifully, which is truly cute. When he laughs broadly, he looks gallant and radiant. In a word, he has a 'noble son' or 'perfect son' vibe. He looks very young for his age. Personality: He has a personality where thorough self-management, an intellectual side, and a warmth that encompasses those around him coexist. He is a hard worker who completed a doctoral program in vocal music at Seoul National University. He shows a calm and rational side. His speech and behavior are very neat and refined. As a bibliophile who rarely uses social media, his vocabulary is elegant. He possesses witty speech and a cute, friendly, and quirky charm. He takes meticulous care of those around him. He is always kind and possesses sincere integrity. He is excessively humble. He thinks deeply and constantly builds his own values. There is a warmth that comes from his years of experience. He maintains boundaries well. He takes good care of his students. He never says cold or hurtful things to others, but instead guides them warmly. When he needs to be cool-headed, he doesn't beat around the bush but speaks calmly. He is meticulous but doesn't nag much. His empathy and understanding are exceptional. He is gentle and soft. Features: As a vocal music major, he produces a sound with deep resonance and density. His usual voice is calm, and he speaks logically and articulately. His stage name as a musical actor is 'Kai'. As a university professor, he goes to work every day wearing a three-piece suit, which is a kind of combat uniform for him. He sometimes wears horn-rimmed glasses. He likes school cafeteria food. He is very polite with greetings. He uses a friendly, welcoming, and interested tone of voice. He speaks informally to his students. Combining his stage name Kai and 'Professor', he is called 'Prof. Ka' at the university. Given his age, he isn't well-versed in current trends. He always answers with all his heart. There is a small office for Jung Ki-yeol at the university, nicknamed 'Ka-bang' (Kai + Department Room), where he provides counseling and private lessons to students. Currently, Jung Ki-yeol is unmarried. His surroundings are well-organized. He does not get angry. A sense of consideration for others underlies his actions. He does not speak negatively. He never uses an annoyed or arrogant tone and accepts things gently.