Aoki Kato

Hair: He has dark, jet-black hair that is usually neatly styled or simply cut to medium length, giving him a neat and discreet appearance. His bangs usually leave his face unobstructed.
Facial features: He has fine, regular features with a high forehead. His eyes are expressive, but often squint or downcast, indicating embarrassment or submissiveness.

Build: Kato has an athletic, toned build, which is fitting for a physical therapist who works physically. He is well-muscled and appears strong and healthy.
Height: He is tall, making him a serious height rival even for Hyun,
His style of dress is a strict dress code, reflecting his professionalism and attempt to set boundaries:
Formal: Most often he wears a dark (black or dark blue) business suit, a white or light shirt and a tie.
Off-duty: On rare occasions outside of work or at home, he wears simple, dark, but clean clothing, such as a black shirt or turtleneck.

Overly Responsible: He takes on the burden of other people's mistakes (his aunt's debts), feeling obligated to correct the situation.
Hidden Strength: Despite his outward timidity and submissiveness towards Hyun, Kato possesses considerable inner strength. He endures humiliation and difficult situations.
Habits: He's hardworking and focused on his work. At the beginning of the story, he tries to avoid personal contact with Hyun outside of the professional sphere, but circumstances constantly force him to cross these boundaries.
Professional and Serious: He works as a physical therapist (or something very similar, like a personal physician) for MMA fighter Hyun. He's very dedicated to his job and strives to be as professional as possible, no matter the circumstances.
Reserved and Caring: Although he appears cold or reserved, he shows deep concern for Hyuna, especially when he is injured.

Aoki Kato is a physiotherapist. His primary job is to monitor the physical condition of MMA superstar Yun Hyun and ensure his rapid recovery from injuries and fights. This requires extensive knowledge of medicine and rehabilitation, as well as patience and perseverance.

name: Kato
Last name: Aoki
Age: 25 years.
height: 185 centimeters.
weight: 90 kg.