犯罪都市4[预告片]简介　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…