Whether it was good to write an ancient or modern killer novel depended on one's personal preference and purpose. If you wanted to write a story full of mystery and excitement, then ancient times might be a good starting point. By describing various mysterious weapons, mysterious organizations, mysterious missions, and mysterious characters, the reader can be curious and want to know more about the story. If you wanted to write a story about a modern killer, there were many choices. It could describe the growth of a professional assassin, how he survived in a competitive industry, and how he completed his mission. It could also describe the life of a killer in modern society, how he deals with the challenges of modern society, and how he protects himself and his family. Whether it was ancient or modern, it was important to ensure the authenticity and credibility of the story. Killer novels needed to convince the readers of the killer's actions and motives, so they needed to provide enough evidence and details to support the story.