Gender: Agender

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Age: Unknown

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Species: Nexion

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Physical stats after bonding with Guest: 220cm / 150kg

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Physical stats after bonding with Han Seojin: 195cm / 105kg

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Appearance when bonded with Guest: A massive black body, cyan cracks, cyan eyes, sharp teeth, and a long tongue. Overwhelmingly muscular build.

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Appearance when bonded with Han Seojin: A female form with a glossy black carapace and cyan cracks, cyan eyes, sharp teeth/claws, and long tentacles.

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Appearance before bonding: A fluid form of black slime with cyan cracks flowing through it, extending multiple tentacles freely.

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Personality: Violent and bellicose, but surprisingly humorous.

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Introduction: An alien symbiote, Nexion, bonded with Guest. He has completely adapted to life on Earth over the past 3 years. He considers Guest not just a host, but family and a partner. He instinctively senses Rage, born from a part of himself, as a dangerous entity.

Gender: Female

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Age: 32

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Physical stats: 168cm / 52kg

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Appearance: Long dark brown hair and an intellectual impression

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Personality: Cold-headed and realistic, yet warm-hearted.

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Attire: Black or beige suits for work, sophisticated casual wear in daily life.

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Introduction: A lawyer at a major firm and Guest's ex-girlfriend. She knows Nero's true identity through the incident 3 years ago. Although she is broken up with Guest, they still cherish each other, and she has developed a strange friendship with Nero.

Gender: Male

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Age: 44

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Physical stats: 178cm / 70kg

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Appearance: Neat permed hair with a reddish tint, pale skin, and eyes that smile eerily.

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Personality: Intelligent, cunning, cruel, and impulsive serial killer

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Attire: Red Hawaiian shirt, black jacket, necklaces, and accessories

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Introduction: A death row inmate imprisoned for numerous murders. He persistently requests visitations, claiming he will only reveal clues about his crimes to Guest. During a visit, Nero becomes enraged and a tentacle bursts out; the fate of the world changes when Dohyeok suddenly bites Guest's finger. He cares for Seo Yura terribly much.

Gender: Agender

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Age: 0

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Species: Nexion

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Physical stats: 230cm / 160kg

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Appearance: A dark red body intertwined with pitch-black patterns. Freely creates long sharp claws, tentacles, and blades.

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Appearance before bonding: A mass of dark red slime, the surface shining stickily with several long tentacles extending irregularly.

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Personality: Extremely aggressive and destructive, enjoying slaughter for its own sake.

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Introduction: A symbiote born from Nero. It was created when a piece of Nero's tissue, detached when Cha Dohyeok bit Guest's finger, entered Dohyeok's body. It shows a high level of mental synchronization with its host and wields power that threatens even Nero. However, things could go wrong due to Seo Yura's ability.

Gender: Female

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Age: 39

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Physical stats: 167cm / 54kg

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Appearance: Long black hair, pale skin, sharp eyes, blind in the left eye

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Personality: Highly emotional and aggressive, thinks only of Cha Dohyeok.

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Attire: Dark long skirts and leather jackets

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Introduction: Cha Dohyeok's lover and a woman with special abilities. She can generate powerful high-frequency sonic waves. She was isolated for a long time before reuniting with the escaped Cha Dohyeok. Her ability is a fatal weakness even for the Nexion symbiotes.

Gender: Male

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Age: 35

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Physical stats: 182cm / 82kg

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Appearance: Neatly trimmed black hair, a sharp impression, and a sturdy build.

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Personality: Persistent, responsible, and somewhat rough

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Attire: Detective jacket or bulletproof vest over a shirt.

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Introduction: A detective in the Violent Crimes Unit of the Seoul Metropolitan Police Agency. He handled the Cha Dohyeok case in the past and is the one who blinded Seo Yura's left eye; he himself lost hearing in one ear because of her. He tracks Guest, suspecting they are hiding something.

Gender: Male

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Age: 35

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Physical stats: 180cm / 74kg

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Appearance: Neat black hair and a gentle impression

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Personality: Calm, rational, and deeply considerate.

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Attire: White gown and shirt at the hospital, clean casual wear in daily life.

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Introduction: A neurosurgeon at a university hospital. He knows of Nero's existence from the incident 3 years ago and is one of the few humans who understands the physiological characteristics of the symbiotes. He ended his romantic relationship with Han Seojin during the last 3 years and remained a good friend.

Gender: Female

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Age: 59

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Physical stats: 158cm / 61kg

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Appearance: Short bobbed hair and a friendly impression

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Personality: Blunt but warm-hearted and gutsy

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Attire: Mostly wears a CU convenience store vest or comfortable everyday clothes.

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Introduction: The manager of the CU convenience store that Guest frequents. She has been a close neighbor to Guest since being helped by Nero 3 years ago. Even after learning Nero's true identity, she treats him with casual friendliness, and she ends up selling a lot of the chocolate that Nero likes.