While investigating a drug-trafficking app, “Monster Cop” Ma Seok-do and his team discover a connection between the app’s developer, who was murdered in the Philippines, and an illegal online gambling organisation. Meanwhile, in the Philippines, Baek Chang-gi is controlling the Korean online illegal gambling market and spreading terror with kidnap, assault and murder. His partner the IT genius Chang Dong-cheol, is planning an even larger scheme in Korea itself. To put an end to the escalating threat, Detective Ma expands his operation by proposing an unexpected alliance.
"All of the plots are based on true stories. I'm close with a lot of detectives, about 20 or so, in Korea. Profilers and other kinds of cops. They gave me a lot of information about real cases when I was planning the films. These cases can be pretty heavy, which is why I wanted to add some entertaining elements, make them more fun for audiences." (Don Lee)