The amount of investment required to write a novel or film a TV series depended on many factors, such as the popularity of the novel, the market demand for the TV series, the financial strength of the production team, and so on. Therefore, it was impossible to simply answer the question of who invested the most. However, if one were to consider producing a relatively successful novel or movie, the investment for writing a novel would usually be relatively small. This was because writing a novel required a lot of time and energy, while filming a movie required more planning, preparation, and investment. However, the risk of making a film or television series was also higher because there might be some unpredictable problems in the production process, such as budget overruns, script problems, improper selection of actors, and so on. Therefore, whether it was writing a novel or filming a film or television series, it was necessary to conduct sufficient market research and risk assessment to ensure that the investment would get the greatest return.