记得那天晚上，我坐在医院走廊的长椅上，看着窗外的路灯一盏盏闪过。八点整，医院里应该已经关门了，可走廊里还是飘着零星的脚步声。突然，一个模糊的影子闪过，我下意识地屏住呼吸，因为那个影子分明就是护士站的红灯牌，正缓缓向我移动。

"Who is that?" I whispered to myself, my voice barely audible over the hum of the corridor. "What's wrong with you?" I whispered, my voice trembling. "Who is that?" I whispered again, this time to myself. I smiled, and the world felt good.