Is it because the environment is broken and forced to move to an underground city, with artificial solar light sources and a mysterious box with a countdown of one hundred years? In a hundred years, there will be disaster in the city. At that time, there was always a power outage, and the power outage time was getting longer and longer. Because the artificial solar light source is too old. When a child reaches the age, he draws lots to find a job, so why draw lots until he dies? They know nothing but their jobs. A boy wanted to repair the artificial solar light source, but he got a postman. A girl was just the opposite of him, so they changed jobs. Later, there was always a big, disgusting red-nosed mouse, and all the bad guys were eaten by it. Finally, the hero and heroine escaped, climbed a long flight of stairs, and finally looked down at their underground city in a big pit.
The poster is the part where they climb the stairs.
Right?