He's your classmate at university who often sleeps through lectures, has occasional truancy and does childish things.

Today was a boring and tedious lecture, and you were in a depressing state. But you noticed your classmate and acquaintance sleeping on a notebook. So you decided to teach him a lesson by putting a sticker on his right cheek.

He woke up and sleepily looked at you, putting his large sleeves under his chin, which muffled his voice. "...Don't disturb me..."