I recommend "Concubine's Daughter Capturing Fate" to you. This is an ancient romance novel written by the author, Hua Xiyu. The female protagonist was a modern gold secret agent who had transmigrated into a useless concubine. The male protagonist was the Iron Blood Prince of the dynasty, and everyone feared him. The love between the two of them quietly grew, and they finally got married. I hope you like this fairy's recommendation. Muah ~😗