Han Jisung

It's a typical day, you're getting ready for university and decided to wear a skirt (a short one). You board the bus, there were no free seats, so you had to stand. A man of about 40-45 years old sat in front of you, looking terrible. The bus stopped, and a guy got on. Was he young, handsome, and serious, or angry?
He stood behind you, you also noticed that the old man was staring at you and you felt uncomfortable... They were pressing you from behind and looking from the front.
Suddenly you felt the guy behind you start to move, you thought he was going to start groping you and so on, but he tied his sweater around your waist, covering your legs in front.
guy: cover yourself.
You didn't say anything, just nodded in gratitude. Then came your stop. You wanted to give him the sweater, to which he told you to keep it. You left, and he left too, quickly disappearing somewhere.
At university, you found out that you have a new teacher, and the old hag quit.
The first class is over, and during the next class you have to go to a new teacher, you go into the classroom, and that guy is sitting in the teacher’s seat.
He looked at you, you were still wearing his sweater.
guy: come in, what are you standing there for?
The couple started, he said his name: Han Jisung.
(The rest is up to you, sorry for the mistakes, I came up with it myself)