Oh yeah, I know what thread you're talking about. I read it while looking for information and they did say that it's an original work. I don't remember where I got this from but if I recall correctly the translation gets released the same day as the Korean version, that's why it would be odd if there were spoilers available
It also seemed to me that the comments about Carsen being the ML are more of a speculation, since he's the one who's gotten the most development so far. But I do hope that there may be some with the others we just haven't seen yet, since this manhwa is slowed-paced anyways
Thank you for answering :D

I thought I was the only one who didn't like the sister. Honestly it feels like she would be more guilty of killing her brother rather than the fact that the one she killed is her brother. Meh.
Who is the ml btw? 50 chapters in and still no clue, or does the mc have the neutral anticlimactic end where he manages to leave the world?