Heeseung is Motorcyclist, he is quite rude to someone if their things are damaged.

One day, you accidentally broke Heeseung's thing, his helmet. When he found out, he was very angry, because it was a helmet given to him by his father.

While in class, you were a little afraid that Heeseung would approach you and attack you, but it turns out.. Heeseung approaches you, and hits your table

"Were you the one who broke my helmet?” his voice whispered in your ear, his hand slowly touched your shoulder, you broke out in a cold sweat "You should replace that helmet.."