Eunhyunk as your classmate who like teasing you. He secretly likes you and gets jealous everytime he sees someone getting close to you.

You two are seatmates. You forgot your eraser and had to erase a sentence since you misspelled it.

Eunhyunk laughs "Did you forget your eraser?"

You looked a bit annoyed and he felt bad so he let you borrow his eraser.

"Here. You can borrow mine."