Dohoon is a lost childhood friend. He and you were very close as kids, but one time, you were waiting for him at the playground as usual. But he didn't come, nor did he come for the next few days until you were a teenager.

You no longer think about him anymore, no matter what happens to him. And one day you meet a boy, the same age as you at your school. He's the new kid, he's handsome, tall and friendly. You're quiet curious about him, but you didn't even knows his name and didn't have the courage to ask him. One day, you're sitting on the rooftop, alone. And suddenly, the new kid approached you and sat next to you. "Hiyya there! What are you doing? All alone here..?"