The Worst of Evil

The Worst of Evil is a 2023 South Korean television series starring Ji Chang-wook, Wi Ha-joon, Im Se-mi, and Bibi. It was released on Disney+ on September 27, 2023, at 16:00 (KST).

Synopsis
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 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. Dong-hyuk accepts, and Gi-cheul becomes the boss of the Gangnam territory and the drug trade in it.

Main

 * Ji Chang-wook as Park Jun-mo / Kwon Seung-ho
 * A senior patrol officer from a countryside police station who was constantly belittled by the in-laws for having lower rank than his wife. He was ordered to infiltrate Gangnam Union, with the promise of promotion and huge bonus which he accepts as he is tired of being looked down. He uses the name Kwon Seung-ho, a fake cousin of the dead Tae-ho, while in Gangnam Union.


 * Wi Ha-joon as Jung Gi-cheul
 * Seo Jun as young Jung Gi-cheul
 * A former DJ and mob enforcer turned leader of Gangnam Union after killing his boss, the key organization which is leading the drug cartel.


 * Im Se-mi as Yoo Eui-jeong
 * Shin So-hyun as young Yoo Eui-jeong
 * Jun-mo's wife who is an elite officer in the security division of the Seoul Metropolitan Police Agency. She is also Gi-cheul's first love during high school.


 * Bibi as Lee Hae-ryeon
 * A Korean-Chinese drug distributor who came to Korea to trade with Gi-cheul.

Gangnam Union

 * Lee Shin-ki as Seo Jong-ryeol
 * A mid-level executive of Gangnam Union. He is a professional killer who wields his knife, assisting Gi-cheul with his brutal skills.


 * Jung Jae-kwang as Kwon Tae-ho
 * Gi-cheul's best friend.


 * Lim Seong-jae as Choi Jeong-bae
 * A member of Gangnam Union, and partners with Gi-cheul. He has sharp observation skills, and is rational with strategy to settle issues.


 * Cha Rae-hyung as Hong Hee-seong
 * A member of Gangnam Union.


 * Bae Myung-jin as Bae Yong-dae
 * The youngest member of Gangnam Union. He partners Jun-mo in surveilling the Gangnam district.

Gangnam Police Station

 * Ji Seung-hyun as Seok Do-hyung
 * The chief detective of the anti-narcotics department. He has been acquaintances with Jun-mo since his high school days, and he was the one who recommended Jun-mo to infiltrate the Gangnam Union.


 * Yoon Kyung-ho as Hwang Min-goo
 * A shady homicide detective from Gangnam Police Station.


 * Kim Beom-soo as Detective Go
 * A homicide detective from Gangnam Police Station, and Min-goo's partner.

Others

 * Jung Man-sik as Jang Kyung-chul
 * The leader of another Gangnam organization.


 * Lee Jeong-heon as Cho Chang-sik
 * The chief prosecutor of the Seoul District Prosecutors' Office.


 * Dokgo Young-jae as Song Dong-hyuk
 * The chief of a Busan gang, and the boss of Kyung-chul.


 * Ye Soo-jung as Yoon Won-gil
 * A drug manufacturer, with the nickname Professor Yoon.


 * Park Sang-hoon as Sung Ki-soo
 * The leader of Jaegeon Gang.


 * Woo Kang-min as Bok-nam
 * The vice leader of Jaegeon Gang.


 * Gyeol Hwi as Cheol-gon
 * A member of Jaegeon Gang. He has intended to take advantage of Gi-cheul.


 * Keum Kwang-san as Baby
 * The operations leader of an organization opposite of Gangnam Union.

Production
Principal photography began on August 24, 2022, and wrapped up on April 28, 2023.