I was actually wondering this too. Did he show up in Love In Pavilion?
I sort of remember there was a scene where the conflict between humans and demons, it looked like the village where Hong Hong's childhood flashback was. But I didn't specifically see her, only similar vibes.
Maybe it's just me, but I definitely like Hei Fengxi more with his hair in a ponytail more than tied up at the top in a bun. It's too bad there's more scenes with it tied up in a bun...
You're probably right.