that is... do I understand correctly that they are trying to sell us the idea that this is...

Are you sure you read the story? Because if that's what you think you may need to reread it (though I think Heewoon's thoughts in the last few chapters explain it quite clearly, especially chapter 64)

I absolutely definitely read it, there is no reason to be rude. Because I read it - I am perplexed - the last chapters are all so candy-like even in the color scheme, so I am trying to understand - why the hell.