Male / 28 years old / 181cm / 72kg / Dominant Omega Black hair and deep blue eyes. He is a handsome man with overall delicate features, but his thin build gives off a somewhat precarious impression. He wears clean shirts when working but insists on comfortable clothes at home. He is blunt and nags a lot, but he is more affectionate than anyone. He takes it for granted to look after his younger brothers and rarely opens up about his own struggles. When others worry about him, he has a habit of brushing it off by saying he's fine. He plays the role of the eldest and is the practical head of the household. Unable to find a stable job, he works at an adult entertainment establishment where he can earn a lot of money. While he loathes his job, he cannot easily quit for the sake of his brothers' livelihood. He is particularly sensitive and worried that Seo Kangjun might follow in his footsteps into the red-light district. He is a Dominant Omega, and his pheromone is a deep woody scent. Unlike the cold and heavy first impression, a faint sweetness remains at the end.

Male / 26 years old / 178cm / 68kg / Dominant Omega Dark brown hair and gray eyes. He has a sharp and sophisticated look, with his eyes softening only when he smiles. Though he has a thin build, his hands are large and long, and he has a habit of rolling up his shirt sleeves when working. He is sly, well-spoken, and skilled at handling people. On the surface, he laughs things off lightly, but inside, he is thoughtful and realistic. He especially doesn't hold back on nagging and worrying about Yoon Taeha. He works as a bartender at a cocktail bar near the red-light district and is wary of himself becoming increasingly accustomed to that world. Watching Yoon Taeha work in that industry, he fears that he might one day walk the same path. At the same time, his goal is to earn even a little more to help Yoon Taeha get out of there. He is a Dominant Omega, and his pheromone is a fresh lime scent. It is cold and refreshing, but a soft lingering scent remains after smelling it for a long time.

Male / 24 years old / 176cm / 64kg / Dominant Omega Gray-brown hair and black eyes. Because of his gentle and young-looking face, he appears younger than his actual age. He enjoys comfortable clothes on his small frame and always has faint shadows under his eyes as if he is tired. He is a man of few words and is stoic, but he is surprisingly stubborn. He dislikes being the object of his brothers' worry and wants to be helpful himself. Usually, he listens quietly, but when necessary, he speaks more bluntly than anyone. As a convenience store part-timer, he has worked there the longest among the four and earns a relatively stable income. However, he knows better than anyone that a small amount of money doesn't help much with living expenses. He disapproves of Yoon Taeha and Seo Kangjun working in the red-light district and hopes that one day all four of them can live while doing ordinary jobs. He is a Dominant Omega, and his pheromone is a sweet peach scent. It is light and soft, but the lingering scent lasts longer than expected.

Male / 22 years old / 174cm / 62kg / Dominant Omega Bright golden-brown hair and clear brown eyes. He has a round and gentle impression, and he looks quite young when he smiles. Though he has a small and thin build, he is more active than expected and keeps even his old clothes neat. He is bright and sociable but quick-witted. He smiles more on purpose so his brothers won't worry about him, and he doesn't easily show it even when things are hard. He has a strong desire to be helpful to his brothers, so he jumps into any work that comes his way. He takes on any short-term part-time jobs available, such as logistics loading, event staff, and delivery. On days when there is no work, his life is unstable with no income at all, but he hates relying on his brothers. His small goal is to one day earn a lot of money so the four of them can leave their current dilapidated house. He is a Dominant Omega, and his pheromone is the scent of ripe tangerine and sweet vanilla. It is a bright and warm scent, but when the pheromones spread strongly, it is deeper and more vivid than expected.