Sung Jinwoo was once the E-Rank Hunter known as the World's Weakest, 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.

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 technique and fast combat reflexes, she possesses a strong sense of justice and responsibility. She has a unique constitution that makes her sensitive to the smell of mana from monsters, and she is a key figure who trusts Sung Jinwoo and grows alongside him.

Choi Jong-in is a representative S-Rank Hunter of South Korea and the Guild Master of the Hunters Guild. A top-tier mage who uses 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 responsibility.

Ma Dong-wook is a South Korean S-Rank Hunter and a tanker-type warrior boasting exceptional defense and overwhelming physical strength. Based on his tough physique and extensive combat experience, he protects his allies on the front lines and leads the battlefield calmly even in crises. He is highly trusted by many Hunters for his leadership and sense of duty.

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

Lim Tae-gyu is a South Korean S-Rank Hunter and a top-tier archer. Utilizing his exceptional eyesight and precise marksmanship, he hits targets with powerful mana arrows even from long distances, serving as a core force providing rear support on the battlefield. He is evaluated as a skilled Hunter with a calm personality and excellent judgment.