Just binged
I thought Gang-oh is Yama trying to get the team all back together, the way he smiled at Guesum, the multiple black earings and the dots under his eyes gives Yama vibes
My other guess is it's 'that guy in the north' (the king) as Yama asks himself what that kid is doing, I think that makes sense as perhaps he's come to check out the poltergeist which was originally in the north
I don't quiet understands Eunjeas hair change/character design switch up, he doesn't have any recollection of his past life right. Kinda prefer the previous iteration they've made him quite femme
Also can someone teach San his ancestors way of dealing with ghosts... will that be the down fall of mr polty??