Answer
Shi Pei Pu was a Chinese male opera singer who had an unusually close friendship with Bernard Boursicot, a French diplomat stationed in Beijing. Boursicot was convinced that Shi Pei Pu was a woman, and he believed that the two of them were in a romantic relationship. In reality, Shi Pei Pu was a man who was able to convincingly pass himself off as a woman.