
I'll burst in with my theory "No, he's not Sisyphus, but what if we have Hades and Persephone??".
On the one hand, yes - the symbolism is similar to the story of Sisyphus: this stone, which they showed us for some reason, keeping people from death, figuratively, but still (it's a pity the doc didn't have time to finish explaining why they needed Guwon).
But Sisyphus was still a man, a human, and he knew what life was. And I like this theory too, but Guwon is AS IF from the opposite side from Sisyphus - he kills, he has no human morality, he knows nothing about human life.
That's why I'm thinking about Hades. Who was on the other side (or Thanatos), his tattoos, eyes, skin color... very symbolic in my opinion.
His lack of knowledge about rings, sex, basic elementary things, his delight that the Teach was able to explain morality to him and his wrongness.
And ok, I just really like the idea of Hades and Persephone.