Ship of Theseus

Imagine one day you wake up in a mans body. You could not remember your name, your address, or your social media account. The new reality for you is that you are Michael, a philosophy professor at the University of Cambridge. You try to live Michaels life: giving lectures, supervisions, and talks in conferences. Even though you know nothing about philosophy, people agree with whatever you said. Surprisingly, you discover that your past was not simple, and you and Michael have met a long time ago...