Mc has been Reincarnated to a world that is in the past but has Magic powers. He lives multiple lives and now is going under the disguise of a magic teacher at Sören. This wasn't his actual disguise because on his way to this town he was ambushed along with the real teacher but his disguise was broken. To not get caught he pretends to be the teacher because the real teacher died in the ambush. Turns out the teacher wasn't only a teacher but a person working for some organization in which he is the 1st order.
Academy’s Undercover Professor