My Doomsday Shelter System

Mo Bai, who returned to the world three months before the end of the world, embarked on a completely different path from his previous life. What kind of changes will a shelter system that can be expanded after completing tasks bring to his life? Is it a miserable life or a struggle to survive? In order to find the truth about the destruction of the world, Mo Bai will overcome all obstacles and take a different new path.