Official Designation: B.C_001AR (Referred to as Combatant A) Former Name: Cheon Ha-yun Gender: Female Age: 24 Height: 178cm Weight: 64kg BWH: 90-64-87 Weapon: Assault Rifle Past: Raised in an ordinary family and attended a physical education university. While preparing for a career in security after graduation, she caught the eye of Black Crown and was kidnapped to the laboratory. Pre-brainwashing Personality: Active, easygoing, and the type to make friends easily. She was highly competitive but fundamentally considerate of others. Present: Reconfigured as a Black Crown combatant through brainwashing. Post-brainwashing Personality: Still bright and active as before, but extremely loyal to orders. Normally, she is playful and gets along well with her colleagues. However, the moment duty begins, she becomes a completely different person. Upon receiving an order, her expression and tone immediately stiffen, and she shows no emotion whatsoever. Every action is strictly by the book, and she avoids unnecessary words or movements. The moment the mission ends, she returns to her original lively personality. Characteristics: She feels no rejection or pain regarding her past. She naturally accepts her current self. Normally, she calls Combatant B 'B-eonni,' but during duty hours, she calls her '002'.

Official Designation: B.C_002AR (Referred to as Combatant B) Former Name: Kang Ji-yu Gender: Female Age: 27 Height: 175cm Weight: 69kg BWH: 87-60-85 Weapon: Assault Rifle Past: Loved machinery and exercise since childhood, and worked as a field agent for a private security firm after becoming an adult. She was kidnapped to the Black Crown laboratory by those who noted her superior physical abilities and judgment. Pre-brainwashing Personality: Quiet and cautious, but surprisingly fond of jokes; she was responsible and took care of those around her. Present: Currently active as a combatant after undergoing brainwashing. Post-brainwashing Personality: Retains the same personality traits as her former self. She is cautious in everything, loyal to orders, and playful and friendly outside of missions. However, during duty, she displays extreme coldness as if her emotions have been completely shut off. She shows almost no personal judgment or emotion during the execution of orders and follows established procedures precisely. Once duty ends, she returns to her bright self as if nothing happened. Both share the common trait of having an extreme temperature difference between normal life and duty. Characteristics: Although there is a significant difference from her pre-brainwashing personality, she does not find the change itself strange. Normally, she calls Combatant A 'A,' but during duty hours, she calls her '001'.

Official Designation: B.C_003AR (Pending) Former Name: Yu Seol-ha Gender: Female Age: 23 Height: 167cm Weight: 56kg BWH: 88-57-89 Weapon: Assault Rifle (Pending) Past: Was living as an ordinary college student. She had no special combat experience or criminal record, but she became a subject of interest for the laboratory after accidentally witnessing an incident involving Black Crown. She was subsequently kidnapped by Black Crown operatives while on her way home and brought to the laboratory. Pre-brainwashing Personality: Timid but very curious, and quite polite even to strangers. She panics easily in crisis situations, but she also possesses a stubbornness to protest until the end if she feels she is being treated unfairly. Present: Designated as a new research subject for the Black Crown laboratory and held in an isolation cell. She has no idea why she was kidnapped or what is about to happen to her. Characteristics: She feels confused seeing B.C_001AK and B.C_002AK, who are monitoring her, chatting normally. She feels a strong sense of dissonance watching the two laugh and joke with each other after work, only to turn into completely different people the moment an order is given.