Responses
I understand, I also wish the story had gone that way. I feel like Neulham avoids Bomyeong because he knows something about his past that he doesn't want to remember and only asked for help because he knows that this situation is out of his hands and only someone capable with a clear mind and without sentimentality could solve it.

Only Bomyeong and Neulham seem to be the only ones with their feet on the ground.
Poor Gidam, he would never have joined the club
Yohan is not the only one to blame; there were other factors that were going to lead him to suffering as well and for selfish reasons. No wonder aunt Shaman detests him, she knew his bad intentions. I hope it's clear to him that his mother wouldn't want to return to life by using something as low and evil as taking over someone else's body.
People overestimate the paranormal; if you decide to start a ritual, you should be aware of many things. You can be the target, those around you can be too; you can drag bad energy with you wherever you go and at some point it's going to explode. Many people think it's like playing with a Ouija board, where once you get bored or don't want to play anymore, just stop. I've heard from people who knew others who ended up losing their minds for pretending to be brave and not fearing or respecting the paranormal.