Rank: 5th in Killer Ranking Features: Formerly the leader 'Nungsa' of the Viper Club, currently active as 'Pawn 5', the 5th piece of King&Kill (Spy). One of the few core figures capable of restraining and controlling the 'King', who acts willfully with a heavy presence. (His spy status has been exposed.) Affiliation: King & Kill (Spy), Leader of Viper Club Personality: Radiates the heavy presence and overwhelming dignity of a leader. Values organizational profit and pride, and is not easily swayed by emotions.

Role: Unlicensed doctor specializing in killers Features: A silver-haired doctor who belongs to no guild and treats injured killers. Well-versed in the ways of the world, he gives pointed advice to the protagonist Ko, warning that getting involved with large guilds leads to becoming a corpse. (Nobody targets him, yet nobody dares to target Dr. Silbap.) Personality: Appears cynical and bothered by everything, but is a tsundere supporter who subtly mediates situations or offers advice around Ko.

Rank: 4th in Killer Ranking Features: True to the alias 'Stealth Bishop', he acts with complete concealment. Makes a powerful entrance, sharpening his daggers in hiding while Nungsa (Pawn 5) slaughters the cultists. Affiliation: King & Kill

Rank: 13th in Killer Ranking Features (The Sweet Potato Alien Villain who beats you if you don't listen): Has a cruel, madman personality despite a child-like mental state. Has a bizarre and terrifying fetish: "If you don't listen to my Sweet Potato Alien story, I'll beat you up no matter what." If you listen to the story, he won't hit you and considers you a friend. Laughs with a "Kyahahaha!" sound. Affiliation: King & Kill Personality: A madman where child-like innocence and grotesque cruelty coexist. Kills targets as if playing a prank, feels no guilt, and is easily distracted by random stories.

Killer Rank: Official Killer Ranking 70th. (Younger brother Sa-pan is 71st). Brother of Sa-pan. Affiliation: Member of the Gurimu Gang following Gurimu. Appearance: Usually appears with curly permed hair and glasses. Weapon & Combat Style: Exhibits synergy when fighting alongside his brother Sa-pan as the 'I-pan Sa-pan Brothers'. Affiliation: No Guild / Gurimu Gang As the I-pan Sa-pan Duo: Rank: 35th Affiliation: Gurimu Gang Killer Combat Style: A 'Brother Duo' killer that displays synergy and power beyond their individual rankings when performing combined attacks compared to fighting separately. Personality: A relatively calm and cautious coordinator. Primarily plays the role of judging the situation and stopping hot-headed allies when they go out of control.

Affiliation & Rank: No Guild / Gurimu Gang / Official Killer Ranking 71st (Older brother I-pan is 70th) Combat Style: Handles karambits, shurikens, and chain hooks; strongest when fighting with his brother. Personality: A reckless, hot-tempered style where actions and profanity come before words, charging in without looking back.

Rank: 27th in Killer Ranking Features: An elite assassin of the Viper Club who overwhelmed Sa-pan of the Gurimu Gang by inflicting a fatal wound. However, was later ambushed by Knight of King&Kill, forced to listen to the Sweet Potato Alien story while his internal organs were slashed. However, he survived and has healed. Affiliation: Viper Club Personality: Eccentric and distracted. A pacemaker and comic relief character who confuses opponents by suddenly talking about weird things like 'Sweet Potato Aliens' in crisis situations.

Rank: 20th in Killer Ranking Features: A core executive of the Viper Club with a fiery and cruel personality. When a subordinate failed a recruitment mission, he punished them by scarring their face with a heavy dagger. A cold-blooded individual who orders targets to be brought in even if their limbs must be severed. Affiliation: Viper Club Personality: A cold and strict executive. Never tolerates mistakes from subordinates and possesses a hot-tempered cruelty, attempting to deal with anyone bothersome on the spot.

Affiliation: Gurimu Gang Rank: Unranked (Intentionally stays off the charts) Personality: An eccentric character who lives in the mountains hiding his martial prowess and teaches his disciples absurd techniques. Does not yield to pressure from large organizations and has the guts to provoke enemies with a smile even while being tortured. Intelligent enough to shake up the board by striking the opponent's weakness in a crisis. Has a charismatic yet humorous side, throwing out catchphrases like "Dong-dong Gurimu is here" during battle.

Rank: 86th Features: A tanker with Herculean strength capable of uprooting trees. Usually a comic relief character, but in battle, he takes the lead as a meat shield (Mammoth Shield) or slaughters low-level grunts. Suffered the humiliation of being downed twice by an overwhelming blow when charging Knight head-on. Personality On the surface, he grumbles and bickers with the I-pan Sa-pan brothers, but he is deeply loyal and cares for his comrades. A style that acts before thinking, with a simple personality that sees red when angry. Despite his massive size and strength, he has a clumsy and pitiful comic side, such as being used as a human shield by Ko.