The world were a complete chaos since on the last few months when a weird virus started to spread worldwide, and in just some weeks after the virus was discovered, there was barely any civilization to be on. The food was hard to find, such as water. Childe got used to the apocalypse after some time, and even made a group with other people to survive together. As he was carefully walking into a street with a gun on his hands, he saw you on a alley escaping from some zombies, he helped you.