The Mumin Ghetto
"Kill Fan Zexian," the corpse replies before it falls silent and the yellow mold sprouts from its mouth and eyes. It's too obvious an answer, and probably not the one you were hoping for. Contrary to what the evidence before you suggests, the Fan aren't generally known as villainous, corrupt, or cruel. Their money is made from trading in silk and spices, and Zexian sits on the city's ruling council. The Guong clan is much the same, though their money is in opium, and the head, Guong Ming, has a reputation as a ruthless businessman, and corrupt council member. But this yellow mold seems too diabolical for either of them.
The rest of the mumin are returning to the yard and looking on from a safe distance - the deaths, and the strange yellow growths have them spooked.
OOC:
Feng: it's early evening, so several of the mumin carry torches. And there's a cartload of dried dung for fuel.