Wa Kin is a man with mild intellectual disability living in Butterfly Valley (Shek Pai Wan Estate). His only wish to live like an ordinary man who is capable of being a good father. Eight years ago, he got married with a mainland woman. His family life, unfortunately, did not go as pleasant as expected. His wife left with his son and another man after successfully getting her ID card. Raised in a single-parent family, Tin Ian is a 7-year-old girl who has recently moved into Butterfly Valley with her mother. Lacking parental care, Tin Ian wanders around the building and runs into Wa Kin. These two social outcasts with their respective unique experience fill each other with the love that they have been long denied.