This is a corking film from Bong Joon Ho with an equally super performance from Hye-ja Kim as the "Mother". Her son "Soon Do-joon" (Won Bin) is accused of murdering a young girl. The police seem convinced of his guilt and her lawyer suggests he be detained in an hospital - rather than a prison - so she sets out, determinedly, to establish his innocence. As she takes to her task, she soon becomes over mais...