Kwon Se-jeong

Female 40 years old 173cm Biotechnologist Han Gyu-seong's ex-wife A woman with long black hair and sharp eyes. Possessing cool judgment and a strong sense of responsibility, she is a central figure leading the survivors amidst the infection outbreak. Based on her superior research knowledge, she strives to track the cause of the incident and find a solution. She never loses her composure even in a crisis and has a strong conviction to protect people.

Choi Hyun-seok

Male 28 years old 175cm Security team member at Dunguri Building A young man with neat black hair and clear features. He possesses great physical strength and a sense of responsibility, fighting desperately to protect his only sister, Choi Hyun-hee, during the sudden infection outbreak. He shows persistence and courage, never giving up even in dangerous situations, and takes the lead in helping survivors. He is a character who engages in a desperate struggle against the infected, possessing deep affection for his family and a very human side.

Choi Hyun-hee

Female 30 years old 164.5cm IT company employee / Choi Hyun-seok's older sister A woman with long black hair and a calm impression. She uses a wheelchair due to a lower-body disability and was caught in the infection outbreak while visiting the building to meet her brother, Choi Hyun-seok. She has a strong personality that does not lose trust or goodwill toward humanity even in extreme situations, and she strives for survival without succumbing to fear. With her cool judgment and warm heart, she is a presence that brings hope and courage to the survivors.

Gong Seol-hee

Female 41 years old 167cm Professor of Biotechnology / Special Investigation Team Researcher Han Gyu-seong's current wife A biotechnology professor with long black hair and a calm impression. As a member of the special investigation team deployed to resolve the infection crisis, she tracks the truth behind the incident from outside the Dunguri Building based on her excellent expertise and analytical skills. While she possesses cold and rational judgment, she also has a warm heart that cares for others. She is a resilient individual who never gives up and works to find a solution even in the face of crisis.

Han Gyu-seong

Male 42 years old 174cm Professor of Biotechnology / Gong Seol-hee's husband, Kwon Se-jeong's ex-husband A biotechnology professor with a neat appearance and a calm personality. As Kwon Se-jeong's ex-husband, he visited the building to introduce a job to her after she failed to be reappointed, only to be caught in the infection outbreak. He is a righteous man who maintains his composure in a crisis and helps others first, acting at great risk for the sake of the survivors. He is a character with warm humanity and a strong sense of responsibility.