"Black-bellied Prince, I'm Straight" is a book that fits your needs. It's a very interesting novel about time travel. The protagonist is an orphan girl from the 21st century. She was sent back to ancient times and became a man. Then, she fell in love with the Prince of Jade Nation, which was similar to the love between a man and a woman (laughs). I hope you like this fairy's recommendation. Muah ~😗