Gu Zhenyue has spent twenty-five years searching for his daughter. Only after noticing a maple-leaf-shaped birthmark on Gu Nian's collarbone does he begin to suspect that the young woman before him, who rides a tricycle and makes a living collecting recyclables, might be his biological daughter. Despite the contempt of his wealthy relatives and obstacles caused by a falsified paternity test, he never gives up searching for the truth. When everything is finally revealed, Gu Nian at last calls him "Dad," but she cannot bring herself to forget the elderly man who raised her. Gu Zhenyue does not force her to abandon her past. Instead, he accompanies her to pay respects to her adoptive father and respects the life she has always known. The fatherly love that arrived twenty-five years late finally lights the way home for his daughter.