Usually we prefer to either write about cultures we had contact with personally or about which we can consult with a native of said culture. Mongolia was the most challenging one because we didn't have any of these options. We have a friend who studied with a Mongolian exchange student (who's not a furry) and that was far from ideal.
To compensate we had to double down on the research. We read reports from NGOs and civil rights activists that outlined the issues LGBT Mongolians face in the job market, and that the population at large responds well to awareness raising campaigns because they just don't understand basic things like LGBT people being born this way. We mixed that with the mythological family history we came up for Khenbish. We also read a lot of Mongolian poetry to bake some of it's literary style into the narration, and watched movies about the country.
I don't know if our portrayal is fully accurate. Sadly I don't think accepting parents like Altan are as common as people would wish. But as you can see we weren't working in our ideal conditions and had to make do. Hopefully we were good enough and one day a young Mongolian LGBT will have a good time reading Khenbish's story.
Now, about the melancholy in Khenbish's route... It's worth keeping in mind the game's not over yet -- so who knows what's coming next? Regardless, Khenbish is a young man figuring himself out. He's doing it at his own time and speed. When you consider everything he's been through (including his self-discovery and helping his loving family) I'd say he's doing pretty great.