The introduction mentioned that it wasn't a historical novel but a doujin novel, so what did doujin mean?

Doujinshi referred to another work based on a fictional anime, game, novel, and so on. Usually, the new work would retain some elements or characters from the original work or create a new character based on the original character. Doujinshi novels were usually created by imitating the original plot, characters, etc., or modifying and creating based on the original work. Doujinshi novels could be a good way to create because it could provide creators with a whole new creative space where they could use their imagination and creativity. However, it is important to note that doujinshi novels usually involve the copyright of the original work. If you use the elements or characters of the original work without the authorization of the owner of the original work, it may involve copyright disputes. Therefore, when creating doujinshi novels, one had to respect the copyright of the original work to avoid unnecessary disputes.

Fan-fiction and doujinshi referred to novels with the same theme. Doujinshi referred to stories and characters from different cultures and historical backgrounds that were transplanted and fused to create a new story. Danci and Doujinshi novels often involve homosexual topics and express love and emotions by describing homosexual relationships.

Doujinshi referred to novels that were based on fictional literature, anime, games, movies, and other works that were different from the original works. This kind of novel was usually created by fans of the original work or new readers. They might add their own imagination, personality, cultural background and other elements to present a more complete story. Doujinshi novels usually involved the characters, plot, worldview, etc. in the original work, so readers usually had a deeper understanding and emotional resonance with the work. Doujinshi could also be an art form. Many authors would spend a lot of time and effort to create high-quality novels.

Doujinshi referred to a re-created work that was similar to the original work based on a certain anime, manga, game, novel, and other works. Doujinshi referred to the creation of doujinshi, which was based on the intellectual property of the original work. Doujinshi works could include various forms such as novels, manga, illustrations, music, games, and so on. The audience for Doujin anime was usually fans who were interested in the original work and people who liked Doujin creations. Doujinshi could be expressed in different forms to meet the needs of the audience, such as animation, comics, games, videos, and so on.

Doujinshi refers to different works created by the same author or the same work, usually modified or created to achieve different storylines or characters. Doujinshi would usually modify the original storyline or character to create a new work. These works may have the same theme or storyline but present different characters and story atmosphere. Doujinshi works could be novels, comics, animations, games, and other forms of work. They could also be the same author or different versions of the same work. Doujinshi works could stimulate creative inspiration and enrich people's imagination, but they also needed to pay attention to respecting the copyright of the original work and the rights of the author.

Holoistic refers to the second creation of a literary work, game, animation, movie, etc. It is usually based on the plot, characters, worldview, etc. of the original work. It has a distinct personal style and unique cultural characteristics. Doujinshi creations could be novels, comics, animations, games, music, and other forms of secondary creation. They could also be pure literary forms such as poetry and prose. Doujinshi works were often seen as the continuation and development of the original works, reflecting the author's love and respect for the original works. In the field of literature, doujin works were often referred to as " doujin novels "," doujin manga "," doujin animation ", etc. In the field of video games, doujin works were often referred to as " game doujin "," game adaptation doujin ", etc. Although there were many forms and contents of doujinshi works, there were many famous doujinshi works such as the Holoistic series, Holoistic Fantasy World, etc.

Doujinshi M-1 refers to a specific type of Doujin novel, also known as " original Doujin novel " or " second creation novel." It was usually a story created by fans to add their own creativity and imagination to the original work. This kind of novel usually had nothing to do with the original work and was based on a brand new story. Doujinshi novels M-1 usually contain original characters, plots, and worldviews that are different from other doujinshi novels. These novels might be loved by the fans of the original work or attract the attention of other readers. Due to its creativity and variety, the Doujin novel M-1 plays an important role in Doujin culture and many fans like to read these novels.

Doujinshi referred to parallel universes or continuation stories created by different people based on the same work (usually novels, comics, animations, games, etc.). Doujinshi novels usually included re-creations of other characters such as illustrations, manga, animation, games, and so on. These recreations are usually different from the original works, but they can be regarded as an independent cultural phenomenon. Doujinshi can be seen as a unique form of literature because it combines the advantages of the original and the second creation to provide readers with a new story experience. At the same time, Doujinshi novels sometimes involved sensitive content in the original work, so they needed to pay attention to copyright issues.

TVXQ Doujinshi referred to Doujinshi novels that were based on Korean pop culture. Usually, TVXQ Doujinshi would involve the relationships, love stories, and historical events of Korean celebrities, and construct a fictional world based on fans. These novels usually had unique plots and characters that were loved by readers.

Doujinshi refers to different novels based on the same author or the same story background. They are often called doujinshi works. They contain the characters, plot, worldview, and other elements of the original work, but the stories exist independently without direct connection. Doujinshi novels are often loved by fans of the original works because they bring unique cultural and entertainment value.