The first 3 chapter? I think the mc get on a company to work interview and there is a ghost that try to cut him in pieces but mcs blood is like poison to the ghost. Then the mc went to stay in a dorm and accidentally flushed the ghost roomate into the toilet. Actually I don't remember if its either horror or bl because I had already search all horror bl on nu and I still couldnt find it. If somebody remember please, it will be a great help.
“I Was Born Lucky” has the MC flush a ghost down the toilet, but the rest doesn’t sound like what you’re looking for. Camping to find out.
"They All Say I Encountered A Ghost"? I remember reading this but it hasn't been updated in a long time so I had to find it from my reading list.