If you read how the LN ends (comments below or online) and chapter 75, everything will make sense. I’m kindve disappointed though. This series was such a monument of reflection and interest in my younger days, but as I grew, putting the series into the grander picture makes it all seem stupid and narrow-minded.
Maybe, I sought to much from this work as a deep and thoughtful work and forgot that it was a drama romcom, and I dislike dramas anyways for its absurdity and illogical nature.