Set in the 22nd century, climate change has made the planet uninhabitable and people living in man-made habitats. War takes place in shelters. Yun Jung-Yi (Kim Hyun-Joo) is an elite leader of the Allied forces. She became the subject of a brain clone experiment. Clone experimentation is a potential key to winning the war. Seo-Hyun (Kang Soo-Yeon) and Sang-Hun (Ryoo Kyung-Soo) are responsible for the success of the brain cloning experiment. Seo-Hyun is the leader of a team that develops brain cloning and AI technology. Mr. Sang-Hun is the director of the laboratory.