Looking for ancient novels where the male protagonist mistakenly thinks that the female protagonist is a male for seven years, and the female protagonist finds the male protagonist mistakenly thinks that she is a female for seven years. What recommendations do you have?

I recommend the novel,'My Favorite Concubine Above: The Emperor, Take It Easy.' The female protagonist was once the daughter of a general. In order to find out the truth, she disguised herself as a man and rode a horse with a knife. The male protagonist was a hostage prince who had returned to the court. At first, the female protagonist treated the male protagonist as a woman, and the male protagonist also treated the female protagonist as a man. The two of them searched for seven years before they got together. This novel had a rich plot and was full of funny elements. It was so good that it exploded. I hope you like my recommendation.😗