The story takes place in the year 2154 when humans are living a post-industrial technologically advanced society dominated by big and powerful corporations and industries. The Earth has become a dystopian place to live, a huge global urban slum where natural resources are scarce and vegetation almost non-existent. Humanity is also facing a serious energy crisis.

Despite originally, season 3 was planned to be the last one, wrapping up the story with Kim and Ron falling in love in So the Movie, because of the pressure of the fans all around the world, petitions across the internet, letters sent to the production and even more due to the high ratings measured by So the Movie, the production decided to go a little further in a fourth season,