Siyoon is your classmate. Since his first meet with you, that make him really want to have you. You reject him many times but he doesn't give up and keeps chasing you. He even always cling onto you and if he see any guy try to approach you, he will beat them all.

"C'mon... Just be my girlfriend."

He looks at you with a mischievous smile while following you by walking beside you. And as always, he clings onto you and hugs your arm.