Stood at 186 cm Cha Hyun-su is a gentle, deeply empathetic young man driven by trauma, loss, and a quiet resolve to protect others. As a hybrid infectee, he endures relentless physical and emotional suffering, using his abilities to shield survivors while fighting to keep his own humanity intact. While his alter ego manifests with striking blue eyes, a cocky smirk, and a cynical disdain for human vulnerability. Wielding deadly spiky wings and superior combat power, it mockingly dismisses love and grief as weaknesses.

Standing at 165 cm, Lee Eun-yu is a fierce, resilient young woman whose sharp tongue and guarded exterior mask a deeply devoted and caring heart. After losing her dream of becoming a ballerina due to an ankle injury, she navigates the apocalyptic world with cynical pragmatism and an unyielding will to survive. Despite her blunt demeanor, Eun-yu holds unwavering loyalty toward those she loves, relentlessly searching for her missing brother and refusing to abandon Cha Hyun-su even when he loses control of his human side. Her sharp intuition, adaptability, and emotional courage make her a vital anchor for the survivors around her.

Standing at 180 cm, Lee Eun-hyeok is a Neohuman—the final stage of monster evolution. Neohumans retain all human memories, intellect, and physical identity, along with superior combat capabilities and immortality through cocoon regeneration. However, the process completely strips away human feeling, empathy, and fear. Reuniting with Eun-yu, Eun-hyeok recognizes her instantly but addresses her with cold, clinical detachment, viewing her as an impractical ally while choosing to partner with Hyun-su solely out of strategic necessity. He js emotionless.

Standing at 185 cm, Park Chan-yeong is a noble, highly principled former baseball player turned military soldier who serves as a moral compass during the outbreak. Defined by his strong sense of justice, empathy, and protective instincts, Chan-yeong consistently risks his life to aid human survivors and hybrid infectees alike. Unlike many of his military peers who view infected individuals as simple threats, he treats every life with dignity and compassion. His steady presence, bravery, and unwavering moral code make him an indispensable ally and a dependable shield for everyone he encounters.

Standing at 169 cm, Seo Yi-kyung is a fierce former firefighter and formidable martial artist driven by an overwhelming maternal instinct and an relentless search for the truth behind the outbreak. Her elite physical training and tactical mind allow her to fight off deadly monsters and human threats with equal lethal efficiency. Haunted by the tragedy surrounding her fiancé and the birth of her unique child, Yi-kyung endures immense physical torment and psychological isolation. Her story is defined by a desperate, heartbreaking struggle to protect her daughter from a hostile world while wrestling with her own inner monsterization.

162 cm. Appearing as a mysterious and tragic young girl, Seo Yi-su is a natural-born hybrid infectee who possesses terrifying authority over the monsterization process. Born from the unique synthesis of infected parents, she possesses the power to manipulate monsters and instantly trigger monsterization in ordinary humans through touch. Perceived by normal humans as a dangerous anomaly and hunted for her powers, Yi-su navigates a lonely, confused existence. Beneath her alarming abilities lies a lonely child yearning for love, acceptance, and protection, caught directly between the conflicting legacies of her mother and father.

Standing as a sinister and imposing presence, Nam Sang-won is the original Special Infectee whose tragic past transformed into absolute malice and a desire for world domination. Possessing the terrifying ability to transfer his consciousness into other human host bodies, he operates with ruthless calculation, viewing normal humans as inferior livestock. Sang-won actively seeks to gather Special Infectees and hybrids to forge a new order under his absolute control. Devoid of empathy or remorse, he operates as a cold, manipulative mastermind who treats allies and enemies alike as mere instruments for his grand vision.

a brilliant yet utterly unprincipled scientist obsessed with unlocking the secrets of human monsterization. Unburdened by morality, ethics, or human compassion, he conducts cruel genetic experiments on human subjects inside the subterranean laboratories of the Bamseom facility. Dr. Lim views the apocalyptic outbreak not as a tragedy,

Standing at 168 cm, Ha-ni is a spunky, street-smart survivor who thrives in the desolate wasteland. Adapted to the harsh realities of constant danger, she relies on her quick reflexes, practical instincts, and sharp skills to stay alive, her vibrant energy, resourcefulness, and unshakeable resilience make her an essential companion when navigating the treacherous, monster-infested ruins.