The 330 investigation unit, which was tracking the whereabouts of an opium smuggling ring, receives new information. To eradicate this organization completely, the 330 unit requests cooperation from Interpol and launches a joint investigation operation. Kang Hyuk, serving time for drug law violations, fakes an escape and infiltrates Hong Kong to expose Boss Tung's heroin factory, creating a sense of crisis with Interpol's cooperation. Boss Tung of the opium organization, under pursuit, attempts to blow up all his factories but is killed in a police raid. Other suppliers are apprehended by the 330 unit while attempting to bring heroin disguised as imported goods into Incheon Port. Kang Hyuk receives a reduced sentence and lives happily with his motherless daughter.