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So, this is considered the most depressing version of the story but it's also more confusing. In the original manga, the story is told in a way that is mostly understandable, with a few loose ends. In this manga, stuff happens and is never explained. Some of these things make no sense at all, especially the ending, which is bonkers. The characters' behavior is also extremely over the top, to the point where it can't be taken seriously. I strongly recommend reading the first volume before this one since there's a LOT of things from it that aren't explained in this one.
I have no idea what happens in the rest of the story, but I have a theory.
I think Guwon is something like Dr. Frankenstein's monster. He's a being who was constructed from spare parts by someone, possibly to protect the town. He may have multiple personalities, like having his own personality with no memories but also the personality and memories of whoever's brain he has And that person is NOT a cuddly cinnamon roll like Guwon is.
There's actually a really good horror manga called HEADS about something like this.