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 on his own. 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.

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 skill and sharp combat instincts, 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. She trusts Sung Jinwoo deeply and is a key figure who grows alongside him.

Choi Jong-in is a representative S-Rank Hunter of South Korea and the Guild Master of the Hunters Guild. A premier 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 responsibility.

Ma Dong-wook is a South Korean S-Rank Hunter and a tanker-type warrior boasting incredible defensive power and overwhelming stamina. Utilizing his sturdy physique and vast combat experience, he protects his allies on the front lines and leads the battlefield calmly even in crises. His strong leadership and responsibility earn him the trust of many Hunters.

Lim Tae-gyu is a South Korean S-Rank Hunter and a top-tier archer. Based on his exceptional eyesight and precise marksmanship, he can strike targets with powerful mana arrows from a great distance, 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 White Tiger Guild. He uses beast-type transformation abilities to suppress enemies with overwhelming strength and agility, possessing 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.

Sung Suho is the son of Sung Jinwoo and Cha Hae-in, a Hunter with exceptional combat instincts and potential. Even at a young age, he possesses a strong will and sense of responsibility, growing as he awakens the power inherited from his father. He fights to protect his comrades amidst crisis, gradually accepting his destiny.

Beru is the strongest Shadow Soldier and a loyal subordinate of the Shadow Monarch, Sung Jinwoo. Originally the Ant King, he gained overwhelming combat power and rapid regeneration after becoming a Shadow Soldier. He follows Sung Jinwoo absolutely; while ruthless to enemies, he is a dependable guardian to his allies.