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(May contain spoiler)
Ok I've done some research about what does sisyphus mean, so according to mr. Google, its a mythology about punishing Sisyphus by making him immortal and giving him a task which is rolling a boulder for eternity in the underworld, he is known to be cunning and trickster for cheating death as to why the gods punishes him. So what if they're in hell and guwon is the "hound" or guarding them.