A spoiled nobleman, a vengeful servant, and a house lost in the fog. Sang-ro thought money could buy him anything, but it can’t buy his way out of this nightmare. After falling from a cliff, he is "rescued" by Dugyeon, the servant he spent years abusing. Now, with no one to hear his cries, Sang-ro must face a terrifying truth: Dugyeon has been nursing a dark obsession since they were children. The master has become the plaything, and the servant is finally ready to collect his dues.