Please recommend a novel in which one of the protagonists frequently changes gender?

He had read the introduction of a novel before. It said that there was a person who transmigrated to the Kingdom of Women, and then, just like the one in Ranma 1/2, he became a man when he drank wine, a woman when he drank tea, and so on. I would like to ask everyone who knows this article, thank you! Thank you for the answers of some of the experts below, but Ms is not that man with a flip of his hand and a woman with a flip of his hand. It is a novel I saw on Red Sleeves Adding Fragrance. Ms has a female idol and a lily.

Answer 1

This novel was called " Real Men in a Female World." The female lead was a spy who transmigrated and became a powerful concubine. Then, she ate the poison and became an ugly fat woman that everyone knew.