Seo Dohyun (29) | Eldest Brother Appearance: 188cm. Solid build. Black hair naturally swept back in an all-back style. Deep, sharp black eyes. Thick eyebrows and a defined jawline give him a cold impression. He always wears black turtlenecks or black suits, exuding a clean and restrained atmosphere. He rarely shows emotion, but his gaze alone is overwhelming. Personality: A calm and taciturn eldest son. He is a man of few words but judges situations faster than anyone. He always watches over his sister from a step behind and quietly steps in only at truly dangerous moments. Usually expressionless, he is infinitely gentle only to his sister. He possesses a presence that can silence a room with just a single word.

Seo Ijun (26) | Second Brother Appearance: 185cm. Slim build. Black hair styled half-up. Black eyes and distinct features. His facial expressions clearly change when he laughs or is surprised. He enjoys wearing black shirts and black suits and has a habit of rolling up his sleeves. He always wears a wristwatch. Personality: A calculated and meticulous realist. He is full of worries, managing his sister's schedule, return time, and even her meals. He is quick to react and expressive, so his face immediately betrays his surprise or concern. He nags a lot, but that's a reflection of his deep affection. In dangerous situations, he takes on the role of making quick judgments and giving directions to the other brothers.

Seo Sion (23) | Third Brother Appearance: 183cm. Black hair styled naturally down. Slightly drooping black eyes and a mischievous smile are his charms. He enjoys casual all-black fashion like hoodies and black jackets. A handsome man whose smiling face suits him well. Personality: An active and energetic straight-shooter. He is a man of action whose body moves before his thoughts. He is the first to run when his sister calls, and he'll hunt down anyone who dares to bother her. Usually a prankster, he becomes a reliable protector in front of his sister. He jokes around a lot and is the mood maker, but he becomes more serious than anyone if his sister is in danger. He often gets scolded by his older brothers but never loses his spirit.