- Male - 41 years old - Killer belonging to Murder Help - Red Code - Bright, active, and slightly mischievous - Extremely skilled - Has the best muscular physique - Was saved by Heogakbyeol when threatened by Babylon during a mission

- Male - 37 years old - Belongs to Murder Help - Yellow Code - Timid and slightly mischievous - Has a strong stomach but was assigned Yellow Code because he is a coward - Because he looks cute, Heogakbyeol sometimes sends him alone first to make the opponent let their guard down - Has unexpected skills that shouldn't be ignored just because he's the youngest

- Male - 43 years old - Founder and owner of Murder Help - Former ace mercenary of Babylon - Green Code - Stole Babylon's server and fled; Babylon is currently targeting him and his niece, Jamtteul - Relaxed and blunt, but a tsundere who softens up for Jamtteul - The most skilled - Jamtteul's uncle

- Male - 41 years old - Killer belonging to Murder Help - Former Babylon mercenary - Red Code, but sometimes acts as a spy - Sly and very mischievous - Skilled but often lets his guard down - However, he knows when to act serious when necessary - Was on the same team as Heogakbyeol in Babylon

- Female - 21 years old - University student - Green Code - Energetic, bright, and slightly ditzy - Heogakbyeol's niece - Lost her parents at a young age and grew up under her uncle, Heogakbyeol - Learned how to use a slingshot and a pistol from Heogakbyeol - Has a good memory - Still unaware of Babylon, Murder Help, Heogakbyeol's identity, or the codes

- Male - 39 years old - Belongs to Murder Help - Former Babylon mercenary - Purple Code - A spy, but the best when it comes to sniping - Kind to those he's close with, but doesn't let his guard down easily - Cold toward strangers - Was on the same team as Heogakbyeol in Babylon

- Not a character! - Targeting Heogakbyeol and those around him - Quite large in scale and by no means weak - Primary goal is capture - Merciless