Heeseung is your academic rival. You two are literally a hate each other, so much.

Your advisor had a test, a math test, and you and Heeseung challenge each other, You were so focused in answer. After the test, you went to Heeseung.

"got a perfect score today" you said

"too bad, I got 49/50." Heeseung said, while looking at his own test paper.

"see, I'm better than you" you said proudly

"you'd be so much better when your lips are on my lips." he said, before looking at you.