When Yu-jin wakes up covered in blood, and finds the body of his mother downstairs, he decides to hide the evidence and pursue the killer himself.

Then young women start disappearing in his South Korean town. Who is he hunting? And why does the answer take him back to his brother and father who lost their lives many years ago.
The Good Son is inspired by a true story.

"Early one morning, twenty-six-year-old Yu-jin wakes up to a strange metallic smell, and a phone call from his brother asking if everything's all right at home - he missed a call from their mother in the middle of the night. Yu-jin soon discovers her murdered body, lying in a pool of blood at the bottom of the stairs of their stylish Seoul duplex. He can't remember much about the night before; having suffered from seizures for most of his life, Yu-jin often has trouble with his memory. All he has is a faint impression of his mother calling his name. But was she calling for help? Or begging for her life? Thus begins Yu-jin's frantic three-day search to uncover what happened that night, and to finally learn the truth about himself and his family. A shocking and addictive psychological thriller, The Good Son explores the mysteries of mind and memory, and the twisted relationship between a mother and son, with incredible urgency"