He is a night watchman who lives in the shadow of the city, and is used to using tobacco and alcohol to numb his scarred heart that has long been tortured by the world; she is a lonely bird abandoned since she was a child, suffering from a serious illness and wandering around the world but still using all her strength to keep herself alive. An accident caused a spark of kindness and beauty in their lives that could not have been intertwined. Loneliness has never been the fate of human beings. When the gears of life mesh, all good things will eventually be traced.