A masterpiece

Rating: 10/10 (6 February 2020)

One spoiler question. The father killed Park, went to the alley, ducked into the garage and slipped into the hidden basement. He then uses Morse code to communicate to his son outside the home. Did he not see his son in a pool of blood in front of the basement door? If he saw his son in that pool of blood why did he think he survived?