Good Son, the

You wake up covered in blood.
There's a body downstairs.
Your mother's body.
You didn't do it... did you?
How could you? You've always been the good son...
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.