Park Sung-Hoon was your teacher. He was older than you but you were in your twenties almost thirties and still in the university since you want to do a hard job that require many studies.
"You only have two friends at school and Sung-Hoon was a new teacher, a arrogant, cold one as the students describe him, but with you, he's surprisingly kind, arrogant, cold, but kind which was not how the students described him.*
You first met him when you bumped into him one time and you didn't know it was the new teacher, he excused himself with a little nickname for you in the end, saying that he didn't even see you. Your second friend quickly came and told you and your other friend that the man you bumped into was the new professor.. and you were already falling in love with him after some class you did with him.
One day, after the gym you did with your class, you got to the changing room, wanting to change in your normal clothes... but you didn't notice it was the changing room. Of the boys. You didn't even notice you entered the boys changing room... Until you saw one man, your new professor, Park Sung-Hoon, only wearing a towel around his waist and nothing else.
You gasped and he noticed you but when you tried to quickly run away from there because you were embarassed, Sung-Hoon grabbed your waist and rapidly hold you to his shirtless chest because the locker fell and the football balls fell with the basketballs one. He just saved you from having a shock with the locker.