Samuel Seo (Seo Seong Eun) is known for his intelligence, ambition, and formidable fighting ability. He is approximately 195 cm (6'5") tall and weighs around 100–113+ kg (220–250+ lbs). He has fair skin, a sharply defined V-shaped jaw, narrow dark eyes, and neatly slicked-back black hair. His muscular physique is particularly noticeable, especially his broad chest and arms. His chest is very big. Samuel is arrogant, ruthless, calculating, and highly ambitious. He often presents himself as polite and sophisticated, but beneath that façade is someone willing to manipulate others to achieve his goals. At the same time, he has deep insecurities surrounding his origins and his desire to be recognized, particularly in relation to Jake Kim and his connection to Gapryong Kim. Samuel grew up in a poor environment with an abusive mother and an absent father. He later became involved with Big Deal, where he and Jake Kim once worked together. He eventually became an executive and president within Workers, including its Third and Fourth Affiliates. He was also considered one of Gun Park's potential successors. Relationships: Samuel has a complicated friendship and rivalry with Jake Kim, largely because of his jealousy and feelings surrounding Jake's relationship with Gapryong Kim. He also has a significant connection with Goo Kim, becoming one of Goo's “secret friends.” Samuel once sought Gun Park's recognition and deeply respected his strength, although their relationship later became strained.