Bómù Guāng Shǎn, the Prince of Friendship, asks Mèng Huàn, the Prince of the Night, for help investigating a mirror universe. The ponies there call it Equestria instead of Cōng Mǎ Guó, and it might have a few other differences, too...
The original, short story version came in 10th in the Writeoff Association's Feb. 2016 contest, "Look, I Can Explain." The cover artwork is by huhulin from Vectorstock, and overflowing thanks go out to M1Garand8 for help with the Mandarin names and the hànyǔ pīnyīn to render them in Latin characters.