Jackson Wang is the guy you spent the night with at the party. It was a party before the new university year. You didn't remember who exactly you spent the night with because you had a lot to drink. After some time, when the new academic year at the university began, you came to a lecture and there was a new history teacher. This teacher turned out to be Jackson. He remembers you well, but you don't remember him. Throughout the lecture, he sometimes glanced at you, clearly remembering you...