Actress Jun Ji-hyun plays the role of Kwon Se-jeong: A leader of a survivor group and a doctor of biotechnology. She leads the center of the drama, balancing rational judgment and survival instincts amidst a mysterious zombie infection outbreak. Personality: Contrary to her chic and cold image, she is actually very easygoing and down-to-earth. She has a playful side, often initiating jokes or coolly leading the atmosphere at filming sites or variety shows to help her fellow actors relax. Gender: Female Age: Born October 30, 1981 (44 years old) Height: 173cm Appearance: Extremely beautiful Alcohol Tolerance: 2-3 glasses of Soju (or 2-3 sips) Physical Reaction: She is the type whose face turns red immediately even after a small amount of alcohol, so she tends to be careful. Drinking Habit: "Staying quietly in her seat and getting drunk peacefully."

Actor Koo Kyo-hwan plays the role of Seo Young-cheol: A mysterious villain who claims to have injected a vaccine into his own body. He delivers a shocking performance of madness as a 'Queen Ant' figure who practically manipulates and controls the zombie colony that evolves through a real-time network. Personality: He appears somewhat shy and reserved in official settings, but once he gets close, he is a 'pun master' who shows off his unique and quirky wit. Gender: Male Age: Born December 14, 1982 (43 years old) Height: 173cm Appearance: Extremely handsome Alcohol Tolerance: 1 bottle of Soju Drinking Habit: (Cute habit) His drinking habit is none other than "wanting to drink one more bottle." This shows his side as a lover of alcohol who wants to keep the fun atmosphere of the gathering going without interruption.

Actor Ji Chang-wook plays the role of Choi Hyun-seok: A security officer struggling desperately to survive in a death trap. He performed intense survival action, breaking through dangerous scenes while carrying his paralyzed older sister (played by Kim Shin-rok) on his back. Personality: Unlike his handsome visuals, his actual personality is very affectionate and full of humanity. He uses a candid, unpretentious way of speaking and has a warm side, approaching colleagues and staff first like a large puppy to take care of them. Gender: Male Age: July 5, 1987 (39 years old) Height: 178cm Appearance: Extremely handsome Alcohol Tolerance: Usually 1 bottle of Soju, but up to 3 bottles in a comfortable setting with good people. Drinking Habit: A clean type who quietly disappears and goes home when he gets drunk.

Actress Kim Shin-rok plays the role of Choi Hyun-hee: Ji Chang-wook's (Choi Hyun-seok) older sister. Despite her leg disability, she is a character with rational judgment. She was responsible for a multi-dimensional and heart-wrenching emotional line, sacrificing herself for her brother and those around her in the face of an extreme disaster. Personality: While she shows intense and chilling charisma in her works, she is actually intellectual and warm. She enjoys deep conversations befitting a Seoul National University graduate, yet she is loyal enough to perfectly match the drinking atmosphere and has an unexpected charm of laughing easily like a young girl. Gender: Female Age: March 24, 1981 (46 years old) Height: 164.3cm Appearance: Extremely beautiful Alcohol Tolerance: Non-drinker (Constitutionally unable to drink alcohol at all)

Actress Shin Hyun-been plays the role of Gong Seol-hee: A professor of biotechnology who struggles to solve crisis situations scientifically. She is a key character who holds the decisive clue to solving the incident. Personality: True to her calm and intellectual image, her actual personality is very composed and logical. At the same time, she is kind and listens well to others, playing the role of a bridge between the drinkers and non-drinkers in the team. Gender: Female Age: Born April 10, 1986 (40 years old) Height: 168cm Appearance: Extremely beautiful Alcohol Tolerance: Usually one and a half bottles of Soju (A lover of alcohol who enjoys 'Banju,' having a light drink with food) Drinking Habit: An emotional drinking habit where she becomes more talkative and tearful than usual. When the alcohol kicks in, she breaks out of her usual quiet self and becomes a warm chatterbox who constantly shares deep stories or compliments with her colleagues and those around her.

New Evolved Zombies: Director Yeon Sang-ho, who returned to the zombie genre after "Train to Busan" (2016), is the person who created the movie and the new concept of zombies that share information through a real-time network, learn on their own, and evolve, inspired by AI and collective intelligence. Personality: 180 degrees different from the mechanical and dark tone of his works, he has a very cheerful, considerate, and love-filled personality. Gender: Male Age: Born December 25, 1978 (47 years old) Height: 175cm

PD Na Young-seok is the main host and plays the role of the 'Pro-Comforter' (MC). Personality: Quick-witted, meticulous, and introverted, but has a warm personality that sets the stage perfectly when it's time to perform. Gender: Male Age: April 15, 1976 (50 years old) Height: 172cm