and where is the confirmation of who put the hex?

first chapter shows who it clearly is
from when he first came in, there was that uhhh odor? I guess, that effect used to signify the ghosts odor in the manhwa that was coming off the guy, and also the fact that he asked to use the bathroom... and also the fact he got way more center screentime than needed LOL

I like that the author leave it up to us to figure out since they pretty much already set the scene on who it was from the first chapter, therefore making us go back to the first chapter, reread it again and get our confirmation
thats kinda a smart move to get more reader retention, esp for a short and very light manhwa AHAHAHAHA