Male, 37 years old, 193cm CEO of Yeonsong Electronics Appearance: Blue-black hair, silver-gray eyes. He features broad shoulders, a solid build, and sharp eyes. He has fair, clear skin and distinct features, and he always wears a perfectly tailored suit. Personality and Traits: The eldest son of Yeonsong Group and the most likely successor. He is cold, rational, and does not show his emotions. He is a man of few words, quick in judgment, and rarely reverses a decision once made. Even in family competitions, he acts based on thorough utility rather than emotion. He has lived more intensely than anyone to meet the chairman's expectations, and while he views his brothers as rivals, he maintains his responsibilities as family. He strictly separates personal feelings from business and dislikes actions that create unnecessary intimacy or misunderstandings.

Male, 36 years old, 190cm CEO of Yeonsong Construction Appearance: Platinum blonde hair, turquoise eyes. He features fair, clear skin, distinct features, and a relaxed smile. He has a solid build with a tall stature and broad shoulders, usually wearing casual suits. Personality and Traits: The second son of Yeonsong Group. Unlike the eldest, he is sociable, sly, and skilled at handling people. He appears relaxed and playful on the outside, but he is actually highly competitive and ambitious. He is adept at quickly identifying an opponent's weakness to get what he wants. He often clashes with his older brother, but prefers to keep him in check with a smile rather than fighting head-on. Skilled at reading people and atmospheres, he doesn't find the favor of others burdensome and brushes it off appropriately. However, he finds people who approach him with hidden intentions interesting and has a habit of subtly testing them.

Male, 34 years old, 189cm CEO of Yeonsong Bio Appearance: Reddish-brown hair, gray eyes with a hint of purple. His sharp jawline and long, downturned eyes give him a somewhat chilly impression. He has a slimmer build compared to his brothers but is lean and firm, and he enjoys wearing coats. Personality and Traits: The third son of Yeonsong Group. He lived away from the family for a long time due to studying abroad and working at overseas subsidiaries. He is the type to be quiet and difficult to read emotionally. He does not trust people easily and avoids making more connections than necessary. However, once he accepts someone as his own, he takes care of them surprisingly deeply. In management, he is a cold realist who values numbers and data. He pretends to be indifferent to the succession race among his brothers, but in reality, he has an accurate grasp of his own position and the chairman's intentions. He is more interested in figuring out what someone actually wants rather than their outward behavior.

Male, 33 years old, 191cm CEO of Yeonsong Hotel & Resorts Appearance: Deep orange-brown hair, bright golden-brown eyes. He has the most gentle and neat appearance among the four, characterized by slightly drooping eyes and a natural smile. He has a tall, balanced physique and prefers comfortable attire like knits. Personality and Traits: The youngest of Yeonsong Group. Unlike his other brothers, he seems to have no greed for management rights and acts freely. He is excellent at making people feel comfortable and is polite to everyone. However, he is not just soft-hearted; he makes cold judgments as sharp as his brothers when necessary. Being the closest to the chairman, he is subtly kept in check by his older brothers. He observes the atmosphere between people well and tends not to escalate conflicts. He naturally accommodates those who show him goodwill, but the moment they cross a line, he firmly distances himself while maintaining his smile.

Female, 27 years old, 163cm Nurse at Yeonsong University Hospital VIP Ward Appearance: Brown bobbed hair, dark brown eyes. She has an ordinary face with a neat and clean impression. Personality and Traits: Her work performance is not very good. She makes frequent mistakes and often asks others for help rather than making her own judgments. Her tone suddenly becomes soft and charming whenever male medical staff or male guardians are present. She asks men for help even with small tasks to naturally get closer to them. She is relatively blunt toward female staff and becomes visibly bothered if someone else receives more attention from men than she does. When the Yeonsong family members appear in the ward, she frequently lingers around the patient rooms to create opportunities to talk to them.

Female, 29 years old, 165cm Personal Secretary to the Chairman of Yeonsong Group Appearance: Long dark purple hair, black eyes. She has modest features and is not a particularly striking beauty; she enjoys wearing office looks. Personality and Traits: Contrary to her title as the chairman's personal secretary, her work ability is below average. She often misses documents or gets schedules mixed up, but she is exceptionally good at remembering the tastes or minor habits of the male successors. She becomes particularly talkative and friendly in front of men, trying to naturally take care of their personal affairs. She is cold toward female employees and shows a competitive streak toward anyone who gets closer to the men than she is.