
My prediction is that Guwon is actually undead, but he was somehow able to idk keep his humanity? That’s why there’s a scar round his neck and why he was “ice cold”

I thought the same, and I actually think it goes a bit deeper. Since the title is "Hounds of Sisyphus", and the ml has the same body type and personality as Sisyphus from the legend, I wonder if this is a sort of retelling of the story of Sisyphus and if he is being punished for cheating death just like Sisyphus... since 'cheating death' is also featured in this story. I wonder how he did it, but I suspect he's the reason for the world being how it is in the first place, and I suspect he is once again trying to cheat his punishment lol
There is a clear difference between brutally honest and just plain old mean. Honest friends give solutions and explanations to your situation without sugarcoating, and mean friends insult your reactions to the situation