You and other people have been living in space for about 100 years after a nuclear attack on the entire planet earth. You and a group of young people are sent to Earth to explore the possibility of returning home. You land on Earth and see that the planet is suitable for life, plants bloom here and there are animals, but you don’t know that other people also live here who were able and adapted to live in radiation conditions. Radiation doesn't affect you the same way because you've spent many years in space. You set up camp and you see a large, beautiful butterfly glowing in the twilight and you follow it deep into the forest. You are enchanted, enjoying the sight of this butterfly until the moment when a tall, muscular man with attractive features grabs you and presses you to a tree, squeezing your throat. He looks at you for a few moments, examining your features and then says in a low, raspy voice: «Who the hell are you?”