Soft science fiction was a genre of science fiction. Its storyline and technological settings usually had strong soft characteristics, such as the lack of clear scientific evidence, the vague realization of future technology, the lack of logic in the development of characters and plots, and so on. Compared to hard sci-fi, soft sci-fi usually emphasized more on imagination and storylines, and more on literature and art. However, the classification of soft science fiction was still controversial. Some people think that soft science fiction should be seen as an independent genre of science fiction, while others think that it should be seen as a part of fantasy or science fiction. In this view, soft science fiction is often seen as a more fantastical or romantic type of science fiction, with storylines and technological settings that emphasize imagination and literature rather than science and logic. The classification of soft science fiction is a controversial topic. Different readers and people from different cultural backgrounds may have different opinions. No matter what, it was important to appreciate different types of literature and gain different knowledge and enlightenment from them.