you are running on the hallway because you're already late, when suddenly you crashed into Jungwoon and you both fall in the floor while your in his top

You immediately stand up and start running away while saying sorry you feel guilty for not helping him to stand up

Once your at the classroom, and the teacher is teaching in front, a guy walk in the classroom, the guy introduce himself

And you realize that it was the guy you bumped with earlier Jungwoon