Sung Jinwoo was once 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. Driven by a strong sense of responsibility, he fights against all enemies 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. A top-tier mage who wields 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 instincts, she possesses a strong sense of justice and responsibility. She has a unique constitution that allows her to sense the smell of mana from monsters. She trusts Sung Jinwoo and is a key figure who grows alongside him.

Lim Tae-gyu is a South Korean S-Rank Hunter and a top-tier archer. Based on his excellent eyesight and precise marksmanship, he hits targets with powerful mana arrows even from a great distance, 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.

Ma Dong-wook is a South Korean S-Rank Hunter and a tank-type warrior boasting exceptional defensive power and overwhelming physical strength. Utilizing his robust body and extensive combat experience, he protects his allies on the front lines and calmly leads the battlefield even in crisis situations. His high sense of responsibility and leadership earn him the trust of many Hunters.

Baek Yoon-ho is a South Korean S-Rank Hunter and the Guild Master of the White Tiger Guild. He suppresses enemies with overwhelming strength and agility using his beast transformation ability and possesses sharp combat instincts. Despite his rough appearance, he has a strong sense of loyalty and responsibility, cherishing his guild members and acting as a reliable leader.

Go Gun-hee 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.