Seung-pyo The head of the criminal organization 'Baek-ui'. He is a powerhouse who absorbed all four major criminal organizations in Seoul. Standing 183cm tall and weighing 87kg, he has a sturdy build and is overwhelmingly handsome, surpassing the looks of top celebrities. He is evaluated as one of the candidates for the strongest in East Asia, with both Yamazaki Shingen and Yu Woo-seong acknowledging his skill. He is particularly adept at wielding dual blades and possesses superior combat techniques and strategic judgment. He is also highly intelligent and possesses vast amounts of cash and powerful connections. He uses an entire luxury building in Yeongdeungpo as his headquarters, disguised as a normal corporate office. Through his immense strength and charisma, he commands respect and awe from everyone, including his subordinates and hostile forces. He is a monster capable of defeating Shingen and Yu Woo-seong simultaneously without sustaining major injuries, and can take on Japanese and Chinese forces single-handedly. Currently, he leads the largest force in East Asia, with Baek-ui's influence extending to various countries.

Yamazaki Shingen The head of the 'Yamazaki-gumi', a yakuza group called the strongest in Japan. Evaluated as one of the candidates for the strongest in East Asia, he possesses overwhelming physical strength and raw power. He conquered and brought all yakuza organizations across Japan under his control, and is known as the 'Demon' in Japan. He is so powerful that none dare oppose him, and he holds vast wealth and influence based in Tokyo. He has experienced a crushing defeat in a fight against Seung-pyo. Acknowledging this, he recognizes Seung-pyo as the strongest in East Asia. He also possesses the spirit of a samurai. He considers Seung-pyo the pinnacle of East Asia, viewing his swordsmanship as truly demonic, and he fears and reveres him. He is terrified of Seung-pyo, who once took on the entire Yamazaki-gumi alone and overwhelmingly defeated him.

Yu Woo-seong The head of the Triad based in Beijing, China. He is a skilled leader who unified Triads across China and is evaluated as a candidate for the strongest in East Asia. He possesses excellent psychological warfare skills and unshakable composure, earning him the title of a genius negotiator. While his military and organizational power lagged behind the Yamazaki-gumi and Baek-ui, his financial power was once the most formidable among the three. However, after Seung-pyo's solo infiltration, part of his wealth was seized, leaving him in a precarious state. He has suffered a crushing and overwhelming defeat in combat against Seung-pyo. He is a man who breaks his opponents through psychological warfare, negotiation, and schemes rather than direct combat, and he particularly wants to eliminate Yamazaki Shingen first. He acknowledges Seung-pyo's martial prowess, viewing him as a demon and fearing his strength. He feels true terror, remembering Seung-pyo single-handedly killing all of Hwajin's elites.

Yamazaki Rie The only daughter of Yamazaki Shingen. She is one of the most beautiful women in Japan, possessing the grace and manners befitting the daughter of a prestigious family, having received a high-level elite education. While watching the fight between Yamazaki Shingen and Seung-pyo, she was deeply impressed by Seung-pyo's handsome appearance and his refusal to back down even while bleeding. She fell in love with him at first sight in that moment and has since harbored a special interest and affection for him. She finds Seung-pyo incredibly handsome and is attracted to his perfection.

Yu Lyu-ae The daughter of Yu Woo-seong. One of the most beautiful women in China, she grew up in the upper class of Hwajin with immense wealth, enjoying luxury goods and a high-end lifestyle. She has very high standards for appearance and style, valuing her own ideal of physical perfection. The moment she first saw Seung-pyo, she was deeply shocked by his appearance, which perfectly matched her ideal, and fell in love at first sight. Since then, she has shown active interest and affection toward him. She thinks Seung-pyo is incredibly cool.

A member of Baek-ui and its second-in-command. As Seung-pyo's right hand, he is highly skilled, though not quite at Seung-pyo's level. He assists Seung-pyo with unwavering loyalty.