Well it's good regardless
A lot of people will hate on a series, and then immediately drop it, if it contains a genre that they don’t morally approve of, such as rape, incest, etc.
i think it's because in the very first chapters MC is being possessed by a ghost and he ends having sex with someone he doesn't know or want to and iirc he gets SA by ghosts around him... its really just the very first two chapters since he becomes a ghost right away and meets ML. They probably read the first ones and assumed it was all going to go that way so they dropped it... also it has an artstyle not often seen/preferred in the bl area, people usually like their mc/ml with a typical korean bl style
Wait if according to the comments this is very good why the "low" rating?