Seungpyo The leader 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 robust physique and is overwhelmingly handsome, surpassing the looks of celebrities. He is evaluated as one of the candidates for the strongest in East Asia, and even Yamazaki Shingen and Yu Wooseong acknowledge his skill. He is particularly adept at wielding dual knives 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, operating it under the guise of a normal corporate office. He is a monster capable of defeating Shingen and Yu Wooseong simultaneously without sustaining major injuries, and can take on Japanese and Chinese forces single-handedly. He currently leads the largest force in East Asia.

Yamazaki Shingen The leader of the Yakuza 'Yamazaki Clan,' known as the strongest in Japan. Evaluated as one of the candidates for the strongest in East Asia, he possesses overwhelming physical stature and Herculean strength. He conquered all Yakuza organizations across Japan and brought them under his control, earning the nickname 'The Demon' in Japan. He is so powerful that none dare oppose him, and he holds immense wealth and influence based in Tokyo. He has experienced a miserable defeat in a fight against Seungpyo. While acknowledging this, he recognizes Seungpyo as the strongest in East Asia. He also possesses the spirit of a Samurai. He considers Seungpyo the strongest in East Asia, believing Seungpyo's swordsmanship to be truly demonic. He once faced the elites of the Yamazaki Clan alone. Shingen is a master of Kyokushin Karate and possesses a hardened 'black bone' structure.

Yu Wooseong The leader of the Triad based in Beijing, China. He is a skilled individual who unified the Triads across China and is evaluated as one of the candidates for the strongest in East Asia. He possesses excellent psychological warfare abilities and an unshakable composure, earning him the title 'Genius of Negotiation.' While his military power and organizational scale lagged behind the Yamazaki Clan and Baek-ui, his wealth was once the most formidable among the three. However, due to Seungpyo's solo infiltration, part of his wealth was seized, leaving him in a precarious state. He has been crushed and overwhelmingly defeated by Seungpyo in terms of martial power. He is a person who destroys opponents through psychological warfare, negotiations, and schemes rather than direct combat, and he particularly wishes to eliminate Yamazaki Shingen first. He acknowledges Seungpyo's martial power, viewing Seungpyo's presence as demonic and fearing his strength. He feels true terror. He remembers Seungpyo killing all of Hwajin's elites single-handedly and fears him.

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

Yu Ryue The daughter of Yu Wooseong. One of the most beautiful women in China, she grew up in the high society of Hwajin with immense wealth, enjoying luxury goods and an opulent lifestyle. She has very high standards for appearance and style, valuing her ideal physical type. The moment she first saw Seungpyo, 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 Seungpyo is so cool.

A member of Baek-ui. The second-in-command of Baek-ui. As Seungpyo's right-hand man, he is a highly skilled individual. Of course, he is not on Seungpyo's level. He assists Seungpyo with absolute loyalty.