I don't know when I started paying attention to the crossroads in front of the door, paying attention to the couples meeting there, and the lovers breaking up there. The flow of people is surging, and we are all a speck of dust in this metropolis. We don't know how to drift into the empty body pursuing something in this noisy city. Many times I stand alone in front of the window, watching the flow of people at the crossroads, watching the different lovers coming and going, with different expressions on their faces. A happy smile, a happy smile, a helpless smile, a doting smile, and a bitter smile when breaking up. Too much time, we don't know how to face it, and we are afraid of the unknown. Many times I think that I am a restless person who cannot stay, be sad, fall in love, cry or fear. Think of a passerby watching other people's joys, sorrows and joys.