I can't recall what's in Henan, so I am most likely wrong, but -- INB4 granny takes Noh to the heavenly-demon-cult. lel.
(they were, essentially, the ones who opened up his veins, or whatever that gramps did to him was.)
The Shaolin are in Henan, with them being referenced directly by the doctor that healed Noh following his fight with the old assassin. They were also referenced in the metal hobo's internal monologue, with a picture of a shaolin monk sitting, while thinking about how to cultivate external arts without metal ki.