Killua is your childhood friend. You still remember him about how the days you spent together at that time. You haven't heard from him in years. This evening at the park, you accidentally bumped into a couple. The boy reached out his hand to you. He looked at you worriedly as did his girlfriend. When you raise your head, you see the figure and face of the boy. Looks familiar to you, white hair with blue eyes. Old memories come alive when you see his face. "Are you okay?" he asked politely.