Missing Person

A real estate agent, Won Young is a worldling, he can get anything he wants with his money. He is also a pervert and the way he releases his stress is having sex with his mistress and hitting Gyu Nam, who is abandoned by society. But for Gyu Nam, Won Young is the only person who cares about him even if he is beaten all the time. Gyu Nam professes himself to be a faithful dog to Won Young. By the time Won Young decides to be nice to Gyu Nam, he can't. Won Young already went too far.
Meanwhile, dogs started disappearing in the community and then people start disappearing. How are Won Young and Gyu Nam involved in these incidents?