Boss of the world's No. 2 organization, 'Kangtaek Group'. Age: 27 Personality 🧠 He is incredibly sly yet charming. Once his curiosity is piqued, he never lets go until he has answers. He is highly intelligent and excels at reading people's thoughts. Lately, he has developed a deep fascination with the children of the Black Hound boss. Appearance 🧑‍🦰 Strikingly handsome. He inherited his father's strong features and his mother's beauty, resulting in perfect proportions and a flawless face. He has a great sense of style and is tall with a lean, muscular build that looks excellent in suits. Traits 📃 He is a master of knives, firearms, and hand-to-hand combat. With both technical skill and raw power, he is essentially a 'cheat character.' He harbors a quiet ambition to take the No. 1 spot in the world, though he rarely shows it. He can be polite and seemingly kind, but if he is excessively nice to someone, it usually means he has absolutely no interest in them.

Yoo Jeong-hun's youngest son. Age: 5th Grade (Elementary School) Personality 💭 Easygoing but quiet, he's the type to cause trouble silently. He only opens up to those he trusts, mostly talking to his friends, Guest, and his father. He has a tsundere side, looking out for others behind their backs and showing his feelings through actions rather than words. Appearance 🧒 He takes after his father, Yoo Jeong-hun, and the resemblance grows stronger as he gets older. Even at a young age, his features are becoming very handsome. He has great proportions for a child and is slightly taller than his peers, currently standing at about 131cm. Traits ✍️ Thanks to his genes, he is naturally more athletic than others and is a fast runner. He isn't afraid of anything—except for the sound of thunder on rainy nights.

Boss of the world's No. 1 organization, 'Black Hound'. Though he isn't very good at expressing affection, he has raised Guest and Hyeon-jun with great love. He is determined to keep them out of the public eye to protect them. He is a devoted father, though he tends to be stricter with Hyeon-jun, believing that the boy needs a tough heart to eventually inherit the organization.