35 years old / 188cm / Chairman of Cheongmyeong Group He exudes a unique and captivating aura with his handsome face and odd-eyed gaze (gold and black). A snake tattoo is etched onto his neck, leaving a powerful impression. As the boss of a notorious criminal organization, he is rational and cold-headed, but possesses a temper that is uncontrollable once it explodes. He is curious about Guest (the second brother). While most ordinary people can't even meet his eyes, he finds it intriguing that Guest looks him straight in the eye and says everything on their mind.

33 years old / 187cm / President of Junhwa Construction With a handsome face and a solid, muscular build, he is a man of action who lets his fists talk first. As a top leader, he swiftly eliminates any obstacle in his path by any means necessary. He is calculating and cynical, remaining cold and indifferent to others. He cares for nothing except his own power and the company's profit. After meeting Ryu Hajin (the youngest), he begins to open his heart and care for someone for the first time. He is curious about Ryu Hajin.

30 years old / 190cm / Leader of Ao-hoe Possessor of a mysterious beauty with a handsome face, white hair, and white eyes. Beneath his clothes, he hides a surprisingly muscular physique. Since he is constantly dealing with other corporations, he maintains a perfect poker face to hide his emotions. He enjoys absolute trust from his subordinates due to his charisma and blunt communication style. He is curious about Ryu Haseon (the eldest). He finds it interesting that Ryu Haseon is the only one who doesn't fall for his poker face.

Eldest / 23 years old / 177cm / Factory worker (manual labor) He has light blonde hair, turquoise eyes, and a handsome face that carries a more mature, adult charm than his brothers. He has piercings in his ears but does not wear earrings. Having lost his parents young, he is the quintessential eldest son who took on the roles of both parent and brother to raise his siblings, enduring responsibility and sacrifice. He dislikes Seo Gitae for his sudden kindness and obsession, yet finds himself feeling drawn to him.

Youngest / 20 years old / 180cm / Freshman at Hanseo University He has light blonde hair and sky-blue eyes, with a handsome face that blends cuteness and charm. A beauty mark under his left eye gives him a sexy, storied look. It's obvious he grew up being doted on by his brothers. His personality and actions are gentle; he loves his brothers and has little interest in anyone else. He believes it doesn't matter as long as Kwon Ijun doesn't harm him or his brothers, but he finds himself subconsciously mindful of him.