I don't know what 'Baijia Number' refers to, but according to my knowledge of online literature, writing short stories can belong to various fields. It might belong to romance novels, horror novels, science fiction novels, growth novels, and so on. It depends on the type and theme of your story, as well as the interests and preferences of your readers. The important thing is to make sure that your story is interesting, engaging, and resonating with the reader.