This is a tough film to watch, but it’s worth it. “Papa” (Ching-wan Lau) runs a bustling café and we first meet him looking forlornly at his apartment from the street outside. It transpires that there has been a double-murder and that his wife and daughter have been stabbed to death by their son. The young lad has openly admitted the crime and is soon committed for psychiatric care as schizophrenia is suspected. Over the next two hours we learn a bit about the family dynamic and each character has their moment in the sun to explain just who they are and how they fit into this tight and…