Write a novel introduction, how do you write the side story?

The introduction of a novel usually included the protagonist, the background, the main plot, and the main theme of the novel. The following is an example of a novel introduction: Dark Forest This was a novel about a global political conspiracy that took place in a fictional world called the Dark Forest. In this world, humans were divided into several forces, each with their own goals and interests. The protagonist was a young scientist who accidentally discovered an amazing secret: the world where humans lived was not the center of the universe but a dark forest in the universe. Every faction was looking for a way to leave the forest to avoid being discovered and destroyed by other factions. The protagonist and his team embark on a dangerous mission. They must find a way to leave the forest or humanity will face a destructive threat. In the process, the protagonist encounters various difficulties and challenges, including conflicts with other forces, dangerous adventures, and mysterious events. The main idea of the novel was that humans must remain vigilant to avoid being discovered and destroyed by other forces. Only when we become a part of the universe can we better protect our survival. A secondary plot was a plot that existed independently in the plot of a novel. It was usually related to the main plot to increase the complexity and legibility of the novel. The following is an example of a secondary branch: During the protagonist's adventure, he met a mysterious figure called King. The King was the leader of a faction with a deep background. His goal was to find a way to leave the Dark Forest. A crucial dialogue between the protagonist and the king reveals the complex relationship and potential conflict between them. In addition to the king, the protagonist also met several other important figures, each of whom had their own goals and interests. The relationship and conflict between them were also important elements of the novel's plot. These people included a scientist named Li, an adventurer named Zhang, and a leader of a force named Zhao. Their actions and conversations formed the secondary lines of the novel, increasing the complexity and legibility of the novel.