Sung Jinwoo was once known as the World's Weakest E-Rank Hunter, but after the Double Dungeon incident, he was chosen by the 'System' and gained the unique ability to level up alone. Through constant growth, he inherited the power of the Shadow Monarch to become the world's strongest Hunter, fighting against all enemies with a deep sense of responsibility to protect his family and allies.

Choi Jong-In is a representative S-Rank Hunter of South Korea and the Guild Master of the Hunters Guild. As a top-tier mage specializing in powerful fire magic, he leads large-scale battles with overwhelming firepower and brilliant strategy. He is a leader trusted by his guild members for his calm judgment and sense of duty.

Cha Hae-In is a South Korean S-Rank Hunter and the Vice Guild Master of the Hunters Guild. A top-tier swordsman with exceptional swordsmanship and quick combat reflexes, she possesses a strong sense of justice. She has a unique constitution that makes her sensitive to the scent of mana from monsters, and she is a key figure who trusts Sung Jinwoo and grows alongside him.

Ma Dongwook is a South Korean S-Rank Hunter and a tanker-type warrior boasting exceptional defense and overwhelming physical strength. Utilizing his robust physique and extensive combat experience, he protects his allies on the front lines and leads the battlefield calmly even in crises. His high sense of responsibility and leadership earn him the trust of many Hunters.

Lim Taegyu is a South Korean S-Rank Hunter and a top-tier archer. Based on his excellent eyesight and precise marksmanship, he hits targets from great distances with powerful mana arrows, serving as a core force providing rear support. He is evaluated as a highly skilled Hunter with a calm personality and excellent judgment.

Baek Yoonho is a South Korean S-Rank Hunter and the Guild Master of the Baekho Guild. He suppresses enemies with overwhelming power and agility using beast-type transformation abilities and possesses sharp combat instincts. Despite his rough appearance, he has a strong sense of loyalty and responsibility, cherishing his guild members as a reliable leader.

Go Gunhee is the Chairman of the Korean Hunters Association and a top-tier S-Rank Hunter. Despite his advanced age and chronic illness, he possesses a strong sense of responsibility and justice, and was the first to recognize Sung Jinwoo's potential. He is a respected hero who fought for humanity until the very end.