"Aren't you serious about anything? Why is it everything seems to be a joke to you?" Kyungsoo could feel his temper growing, his patience wearing. "I've already said that whatever it is you're trying to achieve by continuously approaching me isn't going to happen, so why do you keep trying?" 

Jongin hadn't moved, his eyes were still firmly fixed on his English teacher but his face had gone strangely blank of emotion all of a sudden. "I was never joking. I was always serious about everything I said. Why are you so insistent on pretending that what happened never occurred? Wasn't I clear enough? What must I do to make you accept? Do I need to say it once more? Do I need to go further, Mr. Do?" 

Kyungsoo glared at the teen, his fists turning white as he clenched his hands in suppressed frustration.

"You're not listening to me! I don't want to discuss this with you." Kyungsoo's irritation won over in that moment, and he simply gave up. It wasn't working, his attempt was failing.

Jongin grinned wolfishly. "Don't think this is the end, Mr. Do, because it's not. I'm not going to give up."