๐I recommend "Island Spy" to you. This novel was written by the author, Hu Xiaomin, who became an isolated island in the Southern Song Dynasty and entered No. 76 to fight against the enemy. The novel is a historical spy novel. Although it is not a complete work, there is a plot in which the protagonist creates a gun to resist the Mongolian invasion. I believe you will like it. I hope you like this fairy's recommendation. Muah ~๐