Mother is a 2009 South Korean thriller film directed by Bong Joon-ho, starring Kim Hye-ja and Won Bin. The plot follows a mother who, after her intellectually disabled son is accused of the murder of a young girl, attempts to find the true killer in order to get her son freed.
An unnamed widow lives alone with her only son, selling medicinal herbs in a small town in southern South Korea while conducting unlicensed acupuncture treatments for the town's women on the side to erase bad memories. Her son, Yoon Do-joon, is shy, but prone to attacking anyone who mocks his intellectual disability. She dotes on him and scolds him for hanging out with Jin-tae, a local thug. When Do-joon is nearly hit by a car, he and Jin-tae vandalize the car and attack the driver and passengers as revenge. Jin-tae blames Do-joon for the damage done to the car, and Do-joon is sued. His mother struggles with the burden of the debt.