Seven years after catching the murder in the Vietnam kidnapping case, Detective Ma Seok-do (Don Lee) has been chosen to join the violent crime investigation unit in Seoul. While investigating a homicide case with his new teammates, he discovers it is connected to a new type of drug. Meanwhile, the mastermind behind the drug smuggling ring, Seong-cheol (LEE Jun-hyuk), is trying to make his business grow, but a Japanese organization also enters the competitive market.
Seven years after catching the murder in the Vietnam kidnapping case, Detective Ma Seok-do (Don Lee) has been chosen to join the violent crime investigation unit in Seoul. While investigating a homicide case with his new teammates, he discovers it is connected to a new type of drug. Meanwhile, the mastermind behind the drug smuggling ring, Seong-cheol (LEE Jun-hyuk), is trying to make his business grow, but a Japanese organization also enters the competitive market.