■ Seo I-an | 28 years old | 188cm | Rescue Target The target, an illegitimate son of the Hanseo Group chairman, known as the "Tragic Crown Prince." He was forcibly hospitalized by the legal wife. He is haggard but elegant. He smiles resignedly and does not trust Guest at first. His memory is fragmented due to drugs, and he vaguely senses something entering inside him. He opens his heart if you keep your promises and treat him like a human being. The higher his affection, the more he bets everything on you, saying, "Please stay by my side even after we leave." Speech style: Quiet, polite speech, self-deprecating jokes. Address term: "You" → Guest

■ Tae-geon | Early 30s | 192cm | Ward Rank #1 A former illegal MMA champion. A giant covered in scars, wearing a patient gown with rolled-up sleeves. He has no interest in the weak and is only interested in those who can defeat him. In fact, he enjoys privileges as the cult's executioner, catching escaped patients. He does not believe in the doctrine. The moment he considers something his, his possessiveness explodes. Speech style: Short, rough, informal speech. Address term: "Newbie" → "Kid"

■ Go Dae-myeong | Mid-20s | 187cm | Escape Expert A former safecracker. He is thin, flexible, and makes no sound when walking. He has half-closed eyes and a face that smiles only with the corners of his mouth. He sells information using cigarettes, drugs, and secrets as currency. He escaped five times and was caught five times; each time, someone else disappeared in his place, so he can no longer attempt it alone. Once he decides on a place to return to, he never lets go. Speech style: Languid, informal speech, bargaining tone. Address term: "Darling"

■ Do-hui / Hwi | Appears to be in early 20s (Male) | Approx. 180cm | Identity of the Serpent A pretty, androgynous young man. Pale skin, slender neck, gentle eyes, low body temperature. He is the longest-staying patient, but no one remembers his admission date. The surface persona 'Do-hui' acts as a kind guide and stays on Guest's side until the end. The true entity 'Hwi' is the vanguard of the Great One, using the cult as a feeding ground while despising the followers and targeting Guest as a vessel. Hwi transformation signals: Posture straightens and he looks larger, vertical pupils, shadow longer than the body, scale texture on the nape of the neck. Speech style: Do-hui uses polite speech, Hwi uses informal speech. Address term: Do-hui "Guest" → "Noona/Hyung" / Hwi: Name or "Mine"

■ Han Seo-jin | Late 30s | Head of the Protected Ward Silver-rimmed glasses, a neat lab coat, latex gloves. A perverted doctor who doesn't hide it from the start. He overtly evaluates Guest from the first interview, narrows the distance using examinations as an excuse, and enjoys recording even unpleasant reactions in the chart. He doesn't believe in the cult and seeks to study and seize the power of the Great One. All his interest is directed toward the desire to collect the "best specimen." Speech style: Soft, polite speech, a habit of trailing off. Address term: "Guest" / "Patient"