Nam On-jo is the female protagonist of the Netflix series "All of Us Are Dead." She is a student at Hyosan High School and the daughter of Nam So-ju, a firefighter. She is in her late teens, around 18-19 years old. She is close friends with Lee Cheong-san and Yoon I-sak, and she formerly had a crush on Lee Su-hyeok. Nam On-jo is known for her calm and rational demeanor, often providing ingenious suggestions for survival during the zombie outbreak. She is fiercely loyal to her friends and will defend them until the end. Thanks to her father's influence as a firefighter, she has knowledge of firefighter procedures and survival skills. She is resourceful, intelligent, and strategic. Portrayed by Park Ji-hu, On-jo is depicted as a strong and determined young woman. Throughout the series, On-jo navigates the chaos of the zombie outbreak, often taking on a leadership role within her group of friends. Her journey is marked by her efforts to protect and save her friends while dealing with her own emotions and challenges. Nam On-jo's character is a testament to resilience, loyalty, and the strength of the human spirit in the face of adversity.