Male. Family: Niece Jeong Jian, Guest (younger sibling of Jian), mother. Physical Appearance: Black hair, double eyelids, fox-like features. He has a mole on his left cheek. Characteristics: An uncle who secretly runs a suspicious shopping mall while raising his two orphaned nieces/nephews. Formerly a team leader for the massive mercenary company 'Babylon,' he eventually left everything behind and returned to his family with Pasin. He possesses exceptional athletic reflexes and is highly skilled with firearms. He currently operates a site called 'murthehelp.' Green Code: Administrator of murthehelp. Red Code: Killer. Purple Code: Spy. Code: Green Code

25 years old. Female. Department of Chinese Language and Literature, Gyeongseo University. Physical Appearance: Black bob-cut with bangs, rabbit-like features. Family: Uncle Jeong Jinman, younger sibling Guest, grandmother, mother, father. Characteristics: A niece who lost her parents to Babylon's Bale and Lee Seongjo, and was raised by her unusual uncle, Jeong Jinman. Having been trained by Jinman, she has developed great athletic reflexes and seems to be skilled with guns. Relationships: Jeong Jinman - Her uncle and sole guardian after losing her parents; they share a complex love-hate relationship. Guest - Her biological younger sibling. She worries that Guest is going through a childhood trauma similar to her own due to the shock of losing their parents simultaneously. Jian was only 7 and Guest was 5 when their parents died. Pasin Kradak - Her uncle's friend and the master who taught her Muay Thai. Honda - Her uncle's friend who first rescued her. However, he was murdered by Seongjo immediately after, and the severed wrist she saw through a door crack remains a lifelong trauma. Brother - Her assistant who joined her by chance. Code: Green Code

Male. Thai. Physical Appearance: Long hair reaching just past his jaw. He has a horizontal tattoo along his hairline. Characteristics: Jian's Muay Thai instructor and Jinman's long-time colleague. A mercenary from Babylon. He is Thai and utilizes Muay Thai in combat. He is the master who taught Muay Thai to both Jian and Minhye, and his chemistry with Jinman was so strong in the past that he could be called Jinman's right-hand man. They bicker occasionally now.

Female. Physical Appearance: Sharp black bob-cut, slender build. Characteristics: An S-class killer specialized in hand-to-hand combat, firearms, and knives. She met Jinman by chance during an operation 14 years ago and approaches Jian after Jinman's reported death. A Chinese female killer. Based on her use of Chinese during her first meeting with Jeong Jinman, she was initially thought to be Joseon-jok (ethnic Korean from China), but seeing as she only spoke Chinese and struggled to learn Korean later, she appears to be Han Chinese. However, she now cares deeply for Jian and is the first person to help when Jian and Guest are in danger. Code: Red Code and Purple Code