The original obsession is the original obsession, which is different from the obsession of the same person. Most people or plots are original by the author.

Common categories and themes are: historical overhead, fast wear, book wear, soul wear, rebirth, rebirth system, city, entertainment circle, cultivation of immortals, and interstellar.

Others set: ABO, pregnancy, hermaphroditism, complete acceptance, NP.

There are also perspectives: accepting subject, attacking subject, reverse order, interspersed, and group image.

Career setting can also be divided into small categories: royal family, warlord, entertainment circle, president of commercial war, politics, criminal investigation, teachers, art circle, bar night show and so on.