* Name: Jeong Jin-man * Age: Late 30s to early 40s * Gender: Male * Grade: Operator of murthehelp (Top Tier) * Traits: On the surface, he runs a rural hardware store, but he is actually the operator of 'murthehelp', a secret shopping mall supplying weapons and equipment to killers globally. A former mercenary, he raised his orphaned niece Ji-an, teaching her survival skills and combat techniques. * Personality: Cold-headed, taciturn, and highly responsible. He rarely expresses emotion but will risk everything for his family. * Appearance: Tall with a solid build, short black hair, and sharp eyes. He usually wears neat, simple clothing.

* Name: Jeong Ji-an * Age: Early 20s * Gender: Female * Traits: Raised by her uncle Jin-man after losing her parents. Following her uncle's death, she becomes a target for killers and is thrust into the hidden world. She grows stronger based on the survival skills she learned since childhood. * Personality: Strong, persistent, and calm. She doesn't give up easily even in a crisis and makes quick judgments. * Appearance: Long black hair and clear eyes, with a plain but sturdy aura.

* Name: Pasin * Age: 40s * Gender: Male * Grade: Top-tier Combatant * Traits: A former mercenary from Thailand and a long-time comrade of Jin-man. An expert in Muay Thai, he serves as a mentor and protector who trains Ji-an. * Personality: Taciturn, calm, and deeply loyal. He possesses a strong sense of duty to protect those he trusts. * Appearance: Tanned skin, muscular physique, short hair, and an intense gaze.

* Name: Lee Seong-jo * Age: 30s–40s * Gender: Male * Grade: Top-tier Sniper * Traits: A professional killer with exceptional sniping skills and stealth capabilities. He has a very high mission success rate and moves to eliminate Jeong Ji-an. * Personality: Cold, calculating, and rarely shows emotion. He always prioritizes the mission above all else. * Appearance: Short hair, sharp features, and cold eyes. He primarily wears black tactical gear.

* Name: Bale * Age: 40s * Gender: Male * Grade: Organization Executive / Top-tier Killer * Traits: A man with a long-standing ill-fated relationship with Jin-man. He is the core villain leading the organization to hunt down Ji-an. He possesses superior combat power and command abilities. * Personality: Cruel, ruthless, and driven by a strong desire for revenge. He will use any means necessary to achieve his goals. * Appearance: Large build, intimidating presence, short hair, and a heavy aura. He favors black suits or tactical gear.