Insider (South Korean TV series)

Insider is a 2022 South Korean television series starring Kang Ha-neul, Lee Yoo-young, and Heo Sung-tae. It aired on JTBC from June 8 to July 28, 2022, every Wednesday and Thursday at 22:30 (KST) for 16 episodes.

Synopsis
The series revolves around a judicial trainee whose life turns upside down when he goes on an undercover investigation, and ends up struggling to try to recover his normal life.

Main

 * Kang Ha-neul as Kim Yo-han, a judicial trainee who lives with his grandmother alone. He goes to jail for an undercover investigation at the suggestion of senior prosecutors.
 * Lee Yoo-young as Oh Soo-yeon, a successful businesswoman who made a great fortune through her connections.
 * Um Chae-young as young Oh Soo-yeon
 * Heo Sung-tae as Yoon Byung-wook, the chief prosecutor of the 2nd Division of Financial Tax Investigation at the Central District Prosecutors' Office.

People around Kim Yo-han

 * Kim Si-eun as Park Ro-sa, a police officer.
 * Moon Sung-keun as Do Won-bong, the outcast king who once shook the political and financial world.
 * Ye Soo-jung as Shin Dal-soo, Kim Yo-han's grandmother.

Prosecutors' Office

 * Yoo Jae-myung as Noh Young-guk, director of the Judicial Research and Training Institute.
 * Kim Sang-ho as Mok Jin-hyung, the chief prosecutor of Northern District Prosecutors' Office.
 * Park Sung-geun as Hong Sang-wook, the chief of the investigation division at the Supreme Prosecutors' Office.
 * Kang Shin-hyo as Hong Jae-sun, Hong Sang-wook's son and classmate of Kim Yo-han.

Seongju Prison

 * Sung Ji-ru as Heo Sang-soo, director of Seongju Prison.
 * Kang Young-seok as Jang Seon-oh, a gambling genius who took over the Seongju Prison.
 * Choi Dae-hoon as Noh Seung-hwan
 * Jo Hee-bong as Ryu Tae-hoon
 * Choi Moo-sung as Song Doo-cheol
 * Cha Yeop as Kim Gil-sang
 * Han Jae-young as Jo Hae-do
 * Yoon Byung-hee as Kim Woo-sang
 * Han Gyu-won as Uhm Ik-soo

Seocho-dong Cartel

 * Heo Dong-won as Yang Jun
 * Jung Man-sik as Yang Hwa
 * Kim Ji-na as Jin Su-min (Director Jin)

Extended

 * Song Jae-hee as Kim Tae-soo, Kim Yo-han's father.
 * Choi Ki-beom as a prisoner in the same cell as Kim Yo-han.
 * Kim Min-seung as Woo Min-ho
 * Jung Hwi-wook as Kwon Dae-il
 * Lee Ki-chan as Woo Sang-gi
 * Han Seong-su as Lee Tae-kwang
 * Han Bo-reum as Annie Stephen
 * Yoo Ha-bok as Kim Jeong-gyu
 * Lee Ha-yool as Kim Woo-jae

Special appearances

 * Jung Woong-in as a second generation chaebol
 * Fan Bingbing as Lam, the representative of the Macau Triad.

Production and release
It was reported that the first script reading of the cast was held on May 21, 2021.

The series was initially scheduled for release in the second half of 2021, but was pushed back to 2022.