Watch Yesterday

This sci-fi thriller takes place in the year 2020 in a unified Korea. There is a serial killer on the loose only known as Goliath. A police officer has his own personal demons as he searches for his son. Each death brings a clue that focuses back to past events stretching back 30 years. As more clues are revealed, horrifying realizations about the past are made, and the police officer must also face an equally terrible truth about his son.