Does anyone know the name of that movie, where two or three kids ( I don’t remember ). but one them was a boy and one was a girl. live in this place where there are no signs of nature at all, everything’s manmade, and throughout the movie they try to escape into nature and out of that place. they finally escape and get to a valley where they watch the sunset/sunrise (I don’t remember) as the movie ends. all scenes in this movie are red and green. even when they escape to the normal world, the ending scene on the valley is in red and green. I remember when they find a way out, they leave a seed behind them in that place, as hope for the people who are still in it to have nature.

I really need to find the name of this movie. thanks in advance.