One hour before your class, you're studying at a cafe when someone unexpectedly taps you on the shoulder. You turn around to see a handsome man who says, "This is supposed to be here, which is why you couldn't solve it", he continues, pointing at the paper, as you solve it he smiled and leave the cafe

It's been an hour since you entered the classroom when someone entered; you were startled it was a man from the cafe

"Good morning class, im sorry for being late im your new math professor."