@Hurokun
It is because honestly, this is another piece of cliche riddled, isekai garbage story. The issue is that it started out very strongly as not being another cliche riddled, isekai garbage story, but has degraded into one.
Easily for the first 5 or so chapters, this story was somewhat unique. A hero returning to the wlrld he once saved, recollecting his harem members, solving the world's issues at the same time. But eversince the demon ming wedding bullshit, the story has gone practically nowhere, just the locations keep changing, they keep adding write-off characters too, which keep reappearing ever 3 or 4 chapters.
The plot is forgettable too, since there was hardly any world building or setup prior to its start. It is like they just began the main plot in the middle of another story, that has already been in going on for a few years, and expects everyone to just role with it like its common knowledge.
Lastly the MC started out way better than he is currently. You opened with an MC who had a pre-established a harem, and had saved the world already. Only to give him a paradoxical weakness (he can't kill his enemies, even if they really need to just die) and expect him still to be able to deal with things where no one dies or is permanently crippled. I mean the strongest man in the world, who ended years of conflict, capable of the highest level of skills and abilities, can't handle 1 yandere stalker, who aparently is more powerful than anyone, including the demon king. I mean, if that fucker was so powerful, why summon MC to begin with?
Its just bad writing, with a plot that seems to be going nowhere, because when one conflict ends, another is already on its second chapter.