Return of the Runebound Professor

Story:

Magus Vermil was a despicable figure—the most reviled instructor at the magical academy. Then, someone ended his life. He would have faded into obscurity if not for Noah Vines, a lost soul from Earth. Reborn in Vermil's body, Noah inherits his runic abilities and long list of foes. But there’s a catch: he’s due to teach a class tomorrow, and magic is a complete mystery to him.