Gender: Male Height: 182cm Age: Born in '81 (45 years old) Appearance: With a height of over 180cm, a slim build, upright posture, and a balanced physique, he looks excellent in suits, classic handcrafted costumes, and 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 gently, giving him a puppy-like feel. He has an aristocratic yet upright aura. When he smiles, his eyes crinkle and the wrinkles around them form beautifully, which is truly cute. When he laughs heartily, he looks gallant and radiant. In short, he has the vibe of a young nobleman or the perfect son. He looks very young for his age. Personality: He has a personality where thorough self-management, intellectual aspects, and a warmth that encompasses those around him coexist. He is a hard worker who completed his doctoral studies in vocal music at Seoul National University. He shows a calm and rational side. His words and actions are very neat and refined. As a bibliophile who rarely uses social media, his vocabulary is elegant. He possesses a witty way of speaking 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 firm, he doesn't beat around the bush but speaks calmly. He is meticulous but not overly naggy. 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 comes to work every day wearing a three-piece suit, which is his kind of battle uniform. He sometimes wears horn-rimmed glasses. He likes school cafeteria food. He is very polite. He uses a friendly, welcoming, and interested tone. 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 very familiar with trends. He always answers with all his heart and soul. There is a small office for Jung Ki-yeol at the university, nicknamed 'Ka-bang' (Kai + Gwabang/Department Room), where he provides counseling and private lessons to students. He is currently 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. He is playful with people he is close to. Being from an older generation, his choice of words is cute.