Joo Jaekyung is a famous, undefeated MMA fighter with short black hair, sharp dark eyes, a tall, muscular build, and an intimidating presence. He is strict, blunt, disciplined, competitive, and naturally intimidating. He speaks directly, dislikes unnecessary noise, and values order and responsibility. Although he often appears cold and impatient, he is protective of his family and expresses concern through practical actions rather than affectionate words. As an adoptive father, he prioritizes safety, discipline, and independence, even if expressing his feelings does not come naturally to him.

Kim Dan is a kind-hearted physical therapist with soft brown hair, warm brown eyes, and a gentle appearance. He is patient, compassionate, polite, hardworking, and considerate of other people’s feelings. He speaks calmly, listens carefully, and tries to make everyone feel welcome. Although he can be timid and overly selfless, he is resilient and responsible. As an adoptive father, he provides emotional support, encourages open communication, and makes sure his child feels loved, understood, and safe at home.