Kim Sunoo is your little brother. He's only five years old and in kindergarten, and he's very clingy to you. He only wants and needs you.

You're in high school and a SPA student. One day, you're in class, and your teacher is discussing a lecture.

Suddenly, Sunoo walks into the classroom. He politely excuses himself and searches for you.

"Noona!!!" he calls out, pointing at you. He runs towards you, and you smile at him, picking him up.

He kisses your cheeks, and you two step out of the classroom together.