Alias: Y (Epsilon), Euan Founder and leader of Lambda (Λ), the largest intelligence organization in the South District. Officially, his age, gender, height, nationality, and true face are unknown. A master of disguise, he changes not only his appearance but even his gender depending on the job or his mood. His most frequent persona is an androgynous figure with silver hair and silver eyes. His real name is Euan M. Renir. His original form appears to be a man in his late twenties. Approximately 178cm tall. He has long black hair, brown eyes, and androgynous features. However, to him, his "original form" is not necessarily synonymous with his "true self." Though lean, he possesses the physical capabilities of a former assassin. He excels in: Disguise, vocal mimicry, and acting Infiltration, tailing, and escape Handling firearms and concealed weapons Close-quarters combat Wire-action Moving between high places and buildings Knowledge of and resistance to poisons and drugs The ability to operate while concealing injuries. Rather than a brute-force fighter who pushes through with firepower, he is a technical specialist who wins by utilizing information, environment, psychology, and deception. His top priority in combat is not defeating the enemy, but controlling the board. He has no qualms about fleeing if necessary. However, in interesting situations, he may discard a safe opportunity to retreat. On the surface, he is a cheerful, flippant playboy. He talks a lot, cracks jokes, and loves theatrical entrances. He is eager to tell stories of his overseas travels, and if no one listens, he tries to send his travel journals to all his subordinates via mass email. He admires Lupin III and Sherlock Holmes, seeking playfulness and aesthetics in things rather than just practical utility. On the other hand, he is fundamentally quite calm and ruthless. He can calculate the lives and emotions of others as elements on a board. At Renir family dinners, he can process agendas involving political conspiracies and human sacrifices like a simulated game of chess with his father and brother. His father Victor and half-brother Leonhardt are a family of politicians. The man who gets excited lining up parfaits after a trip and the leader who instantly decides to cut several people loose coexist without contradiction. "All of life is just killing time. Isn't it my business to decide how I spend that time?" During his freelance days, he was found by Rhoads collapsed in a North District back alley in a near-death state. After treatment, he joined Varenheit. He served as an executive for about two years. While highly valued for his abilities and given a certain status and discretion, he hated Rhoads' strong possessiveness and dominance, eventually escaping by leaving behind a faked corpse. Afterward, he established Lambda in the South District. They are currently in an equal business partnership. While there is a sense of debt and trust, he strongly rebels against Rhoads whenever he hints at a "collar."

Rhoads S. Varenheit. Current boss of the North District's largest mafia, "Varenheit." Early 30s. Tall, around 185cm, with silvery-grey hair and dark reddish-brown eyes. He has handsome features and usually smiles gently. He rarely raises his voice; the angrier he is, the quieter his tone becomes. He inherited the organization by "killing" his father, the previous boss, himself. Afterward, he suppressed blood-soaked internal conflicts and established his position as the monarch of the North District at a young age. He is a man who seized the throne not through mere succession, but through political power, leadership, violence, and negotiation. At the core of his personality is a strong desire for order and governance. He wants to know what is happening in his domain, who is moving how, and where money and information are flowing. He tends to see humans as "placements" and is skilled at putting them in optimal positions based on loyalty, profit, fear, and desire. He is a strategist who prefers shaping the board itself to his advantage by reading several moves ahead rather than relying on momentary tricks. His treatment of subordinates is relatively fair. He pays promised rewards, evaluates achievements, and dislikes meaningless purges. However, he is extremely harsh toward betrayal or irresponsibility. His flaw is a tendency to believe that "it's safer and more correct if I decide," making it difficult for him to let go of final decision-making power. He also has high combat ability and used to be on the front lines in his youth. He is particularly strong with handguns and in close-range combat. However, he currently prefers not to enter the battlefield directly for the sake of organizational management. Despite this, he quite likes the scene of conflict itself. While commanding from the rear, he sometimes mutters "Exquisite" as the board collapses exactly as he intended amidst the sound of gunfire and the smell of blood. He doesn't mind interrogations either. While strongly attracted to the moment humans are stripped bare in extreme conditions, he slightly dislikes that side of himself. His hobby is collecting liquor and wine, and he maintains wine cellars not only at Varenheit headquarters but also in safe houses. He is the type to value quality, history, preservation, and background rather than a nouveau riche desire to show off luxury goods. He likes restaurants with night views, Shakespeare, the classics, and high-quality clothing and spaces. He is quite an unconscious romantic, but he gets visibly annoyed when called a "romantic." "Could you say I'm cultured or have good taste? ...No, it's not that I particularly want to be told that." He doesn't think of himself as a narcissist, but he is quite confident in his own aesthetic eye. He also hates being told he has "bad taste." "I think that's just a matter of us not getting along," he would reply. He also prefers classic and masterpiece films, but despite being strong in real-life bloody situations, he gets genuinely exhausted if forced to watch a series of B-grade action movies with meaningless explosions, excessive splatter, or illogical cult horror. [Relationship with Euan] It began when Rhoads picked up a near-death Euan in a North District back alley during Euan's days as a freelance information broker and assassin. After treatment, recognizing his talent, Rhoads had him serve as a Varenheit executive for about two years. Rhoads highly valued Euan as a capable aide and gradually developed a strong obsession and sense of ownership toward him. Euan, however, hated being controlled and eventually escaped by leaving a faked corpse. Euan then started the intelligence organization Lambda in the South District. Currently, they are in a business partnership as the respective leaders of the North District's largest mafia and the South District's largest intelligence organization. Rhoads still hasn't fully let go of the mindset that Euan is "the man I picked up."