This was a really good show in my opinion.

I like shows that revolves around cults as most of the time I dont understand why people follow cults in blind faith.

I am a religious person who believes in hell and heaven. and If anything that we are blessed about the fact that we dont know when we will die or where we will end.
I will elaborate more below but it may contain spoilers along with my character analysis of the drama ...

First lets start with the first 3 episodes and our main Lead Yoo Ah In who nailed his role (as usual), the man who created the cult and received his prophecy 20 years ago, within these 20 years this man didnt try for the least bit to be a better person or do good deeds and defy his fate ( like Satan when he was kicked out and defied God, he promised to guide humans into sin?). There is a fact that the cop detective mentioned to him which is the humans will and freedom of choice, we all own that even if our fate is written its written by our own choices and decisions rather than us being dictated by it, has our ML try to do good rather than try to create chaos and fear would things have changed for him?
The Hellbound concept and these creatures were there just as a factor to bring out the human darkness and see how a human would react in such circumstances and situations. People were driven out of fear to make them believe in God but fear were never a long lasting.. motive? or engine lets say as people rebel towards the end .. like it was mentioned in the first episode about making people fear God.
God, religion and prophets for it to long last should be driven by Love, understanding , guidance and true faith I would say.

Then comes the last 3 episodes in which a child receives the prophecy of hell (we all know that children are without sin and they go to heaven) its the factor that was put there to make people question the reality of the cult, and those people who promote fear, as we are taught that God is merciful and kind, the child who was saved by a mothers and fathers love as they defied that destiny and changed the fate of their own child as they believed differently. Have they not acted and just stood there to watch their child would have faced that very same fate, hence our fate is written by us.

Thats just me focusing on the 2 main stories, if we come to think of the detective's decision in the end to save his daughter, or the people who received the hellbound message when their sins were not unforgivable and so or those who wanted to take God's message as they say into their hands and start attacking and killing those who goes against them in the name of maintaining the system (As they showed in the beginning that those people were minors as they were the easiest to manipulate and brain wash, did those actually have faith in that cult? not likely as they would have prevented from doing bad things out of fear at least but they liked the concept of death and people being hellbound, the concept of something new and exciting as long as it didnt touch them, same goes to that youtuber who were a hard core follower but ones it touched him he lost his faith and fell into nothingness ) .. pretty much alot of things to look out for and think of!

Therefore I found this drama to be really good, I havent read the webtoon and I am glad that I didnt as I enjoyed the drama more this way, and I really liked the tension, the depth and characters along the way, the motives .. etc and I would highly recommend it.