In the distant future, human beings have a miserable fate. They live in a dark night and there is only one place called Yunhai City. Above Yunhai City is a cloud, which is the only white in the darkness.
He is so bright and so strange. People living here are always dragged to survive above the sea of clouds every three years. Everyone has an initial talent. This talent depends on how you develop it. Only those who have developed an initial profession can go back for a period of time. And the triennial survival game for people who have started their initial careers continues...
Purpose: A happy and serious life