Searching a bl story that I read

Hi guys. I tried every possible way but couldn’t find it. So I am asking for help.

I was reading this manhwa or webtoon, but I do not remember if I finished it. What I remember:

- ML and MC are school friends and ML is older.
- MC loves ML, but ML sees their relationship as fwb. However, ML is possesive, he is the reason MC has no friends. Oh, he is also an asshole!
- MC’s brother starts to the same school and moves in with MC. Brother is very nice and protective. ML gets jelaous.
- ML light haired (white/gray), brother dark haired.
- The brother is weird btw. I remember that in the comments we were talking about if he is a ghost or an other “being”. Everyone can see him though.

That is all I remember, hope one of you can give me a title.

Thanks in advance.