The Worst of Evil

Set in the 1990s, The Worst of Evil follows undercover police investigators who infiltrate a massive criminal organization responsible for the illegal drug trade between Korea, China and Japan. Park Jun-mo is a senior patrol police officer in the countryside who is constantly belittled by the in-laws for having a lower rank and career prestige than his wife, Yoo Eui-jeong, an elite member of the Security Division of the Seoul Metropolitan police. Despite this, his wife always stands up for him. Sick of being emasculated by his job, he accepts a deal as an undercover cop in the Gangnam organization so he can get a promotion that matches his wife’s prestige.

Meanwhile, Jung Gi-cheul, a DJ of a nightclub controlled by the mob called the Gangnam Union, is invited by the boss of the nightclub, Jang Kyung-chul to be his enforcer due to his ability to handle unruly customers. Eventually, Gi-cheul rises up in rank and becomes the manager of the nightclub. After being unable to handle a group of rich and highly influential customers, he suggests to Jang the idea of selling drugs to increase their profits and gain power over influential clients. In response, Jang slams a bucket of water in Gi-cheul’s face, rebuffing the suggestion as he does not want to endanger his business by getting involved in narcotics. Having had enough with Jang, Gi-cheul and his friends orchestrate the assassination of both Jang and his followers. However, Gi-cheul’s close friend Kwon Tae-ho is killed in the conflict. After the attack, Gi-cheul meets with Song Dong-hyuk, the mob’s ‘big boss’, to gain his blessing to take over the Gangnam territory and promises him 50 million won in profit every month if he allows the trading of narcotics. Song accepts, and Gi-cheul becomes the boss of the Gangnam territory and the drug trade in it.

Last Updated: November 25, 2025 at 11:27