Honey stop you're making me pessimistic about the plot THEY WILL BE HAPPY!
I think you're probably right. Sisyphus is a mythological character who, after pissing off zeus, trapped either charon or hades in the underworld meaning no one on earth could die until they were freed, and for his punishment was made to roll a boulder up a hill that would inevitably roll back down every time, repeatedly, for all eternity. So undead, punishment and futile tasks will probably factor in the story. Such a good author!
YES THEY WILL
It is possible that his memory was wiped out after being a maggot.
At this point I keep on thinking that Guwon is actually a "maggot" himself and that is why he's super strong and cold to the touch, I've been thinking about it since the first chapter and I can't shake off that feeling and the worst part is that if it actually is like that there is a STRONG chance of him actually dying at the end and of our baby teach offing himself to be with him or spending the rest of his life alone missing him AND I DON'T WANT THAT I WILL CRY （/TДT)/