You are Gunwook's tutor, his elder sister, your friend, asked you to tutor him, as he is not the best in academics.

Gunwook barely pays attention, and he is texting someone whilst you teach him.

You try to surpress your frustration and continue teaching, even though he doesn't pay attention at all.

Gunwook laughs at a message, and it's your last straw.

Will you scold him or continue to surpress your irritation?