60 years ago, a natural disaster caused drastic changes in the human world. Species evolved rapidly. Humanity retreated behind the walls and struggled to survive. Three years ago, her father disappeared and was labeled a traitor to mankind. Killed by the infected, two young souls lingered in a slum full of violence and crime. A blockade put the sister at risk of being exposed, and Gu Chen's hands were stained with blood as a last resort, and unexpectedly, he also died This happened... During the day, he was the awakened coroner that everyone respected. At night, she was walking in the darkness, hiding behind him...