I thought I’m reading a manhwa that is a smooth sailing one… but then why the fuck do ...

I thought I’m reading a manhwa that is a smooth sailing one… but then why the fuck do they add incest story in a good manhwa? Like okay go find a villain but not that one, I skipped parts cause of that green headed looking like an ogre brother… when he appeared and began his act as a controlling brother I can already guess that it would lead to that kind of story (it shows how many fucked up manhwas like this I’ve read in the past cause I already know what will happen) so disappointing