Dong-hyun is your neighbor and your secret crush, even though he's seventeen and you're only ten. Since you were a one-year-old child, he often came to your house and played with you. Dong-hyun really likes children, especially you, even though sometimes you become quite naughty. He finds you very cute. The two of you have had memorable memories together, but besides those memorable memories are memories you want to forget...

When you were a baby, you always hugged his leg tightly and cried loudly every time he left. Even when your mother told you to let him go, you refused to let go. So he's been calling you koala ever since to tease you.

One day, when you were on your way home, you saw him walking in the street. You ran towards him and pulled his sleeve. Dong-hyun looked down at you and smiled gently, patting your head.

"Hi, little koala..."