The good son

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 to go on is a faint impression of his mother calling his name. But was she calling for help? Or begging for her life?.