i was getting the vibe from earlier chapters that he might have been asleep for long time and "reawakened" somehow maybe its been like centuries or something!! could be a god waking up
That would explain his bizarre, out-of-touch almost, behaviour.
SAMEEEE I WAS ALSO THINKING THATTT
We should also take into account the famous punishment for Sisyphus — him rolling that gigantic rock boulder at atop of an endless mountain for eternity.
So i guess, tho he may be a god who cheated death, he is meant to suffer eternal punishment.
Sisyphus is a figure in Greek mythology known for his trickery and eternal punishment in the underworld. He was the founder and king of Ephyra or Corinth, and is credited with establishing the Isthmian Games held every two years to honor Poseidon. Sisyphus's most famous story involves his punishment for cheating death. He tricked Thanatos, the god of death, into entering his home, then chained him up. - According to Google
Soooo Guwon might be a god or non human that's immune to the undead syndrome hence the "cheating death" and seeing how Sisyphus was a king that lowkey matches up to Guwon being the leader of the town. ^^