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Sisyphus, the king of Ephyra (Corinth), betrayed Zeus, by revealing the whereabouts of a nyphm he had kidnapped. His punishment was to be chained in Tartarus. Thanatos (or Hades depending on what you read) was tricked into demonstrating how the chains worked, and Sisyphus took the opportunity to attack Thanatos and trap him in the underworld.
Thus, no one on earth was able to die.
I.e. Zombies.
Ares, the God of War, was pissed and intervened, freeing Thanatos so people can die again and turning in Sisyphus who was then taken to the underworld, but escaped death once again by tricking Persephone and refused to return until he was dragged back by Hermes.
As punishment, he was made to roll a boulder up a hill, where it would roll back down every time it almost reached the top.
A man who dies, but constantly comes back from the underworld would also be undead, would he not?
We see Guwon escape death in the beginning, crawling out of the rubble, and we know he's different. So I'm wondering if we're in the after Thanatos part but before the Ares and boulder-up-a-hill part, since we have "maggots" and Guwon is always watching that boulder.
In the beginning, Guwon also asks Teach how he feels to have "made it out on the other side of hell" which insinuates that they've all escaped hell (the underworld), which Zeus (or some other power) doesn't like, and they're all going to pay for it because there is someone who is going to come seek retribution from Guwon, but instead of waiting for the other shoe to drop, it's going to be the boulder that drops, and poor Guwon is going to keep pushing it up the hill, trying to fix it.
I don't know where the Hounds come into play though, because Hades is the only one in Greek mythology who had "hounds" (Cerberus) and thus they'd be the Hounds of hell, and unless Sisyphus has become the new ruler of the underworld, then that doesn't quite make sense to me yet. Is Hades chained up and Sisyphus is the one in charge now?
Will "Hades" break his chains and come after Guwon?
The interpretation of Sisyphus' story is that all of this consigned Sisyphus to an eternity of useless efforts and unending frustration, which does not bode well for the story. I think all his efforts to keep the town safe (beating someone to death) is going to be for nothing.
I don't know I'm just rambling, ignore me.