In the gritty underworld of 1970s Busan, a small-time smuggler named Lee Doo-sam daredevil's himself into the lucrative drug trade, quickly rising through the ranks to become the kingpin of narcotics exports to Japan. But as he gains power and wealth, he also becomes increasingly consumed by his own addiction and the dangerous double life he leads. Can he maintain his empire without losing himself completely?

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Some movies that have similar genres and were produced around the same time as The Drug King include The Killer, Kingsman: The Secret Service, Triple 9, Now You See Me 2, Master, Raging Fire.