A show with powerful and very relevant messages Main elements of the series:
Radical Group Arrowhead = QAnon-like with hardcore following influencing/controlling people through their messages and brutality. Dongwook, a true nutjob, is the social media personality of the group that preaches about the wrath of god, sins and living a righteous life in YouTube-like broadcasts while encouraging violence. The group go hand in hand with The New Truth.
The New Truth = Religious organization, cultish and authoritative controlling people through using God, fear, sins, and a divine intervention. Gained power claiming the supernatural creatures are supposedly sending sinful people to hell and only they have the right on how "this phenomenon should be interpreted". Nobody knows, at this point, where these creatures come from or what they truly mean - (agree with one reviewer that probably they represent society's judgements rather than god's).
Social Media/Media/instant uploads = It is quickly and drastically changing the mindsets and actions of people and not for the better. Facts/logical thinking are no longer given enough importance.
The real horror of the show is not the hulk-like figures gruesomely sending sinful people to hell and the mysterious cult-like figure who started it all but the aftermath. That's why the last three episodes are different from the first three. I saw complaints about that but actually that was a smart move by the director because its not about continuing with stories of all the characters from first episodes but about showing a drastic change (from episode 4 on) that most people are now controlled and living in a completely different world after only few years. I think the director wanted to show how fast lives can change through fear, misjudgments and blind following as there are many opportunists out there that take advantage to gain power.
Lastly, If you are looking for another Squid Game type show, this is not it. Nor it is right and quite ludicrous to compare the two!! Also, if you are looking for constant action, blood, gore, CGIs that impress you and easy answers maybe this is not for you either because it's all about the subject matter that is multilayered and philosophical. My only complaint about this series is that some of the acting needs improving in case of a second season so it doesn't come off as pretentious & over the top. As for the undeserving low ratings, especially the many 1-2 star ratings, who knows what's the thinking/motivation behind them (besides the Squid Game effect) but in this case really ignore them and draw your own conclusion.
P. S. From the same director, highly recommend Train to Busan. A zombie horror movie with social commentary about classism & class warfare.