I cant remember the title but I do remember a part where it was in (I think) a magic school and the head master was an elf but he disguised himself as a human and would take a look at the students. I believe there was a teacher that had some issue with the MC. I cant remember if it was a light novel or Web novel turned manga. Any help would be awesome. It has been nagging me for a couple of weeks now.

Thank you.

Shuda

Try World Teacher - Isekaishiki Kyouiku Agent

That was the one. Thank you very much.