if the author really has the balls to have it so the player character never existed and Ruphas was just tricked into thinking she got isekai'd.
changing the main heroine from Kang MiRae to Liera when the latter was more popular and then giving a lot of MiRae's screentime to YuNa when she was, again, more popular. Or Spiera losing a lot of popularity thanks to her "betrayal" and then getting offed for it when she had specifically argued against it in the first place.
but treating Heaven's Army as though it was just as bad as the other three factions really rubbed me the wrong way since by all appearances even later in the story they really were doing the best they could even after abandoning Earth. This eventually turns out to be justified, of course, but very Yu IlHan clearly didn't know that at the time. And even then it's really only Michael and Raphael that are ****heads while everyone else is a good person who gets murdered for not bowing and scraping towards IlHan.
At least until he genocided most of existence that didn't worship him by fusing it to Dareu or just frigging nuking it outright. Isn't that what the story condemned the God of Heaven for? But I guess he's slightly less of a tyrant.