On the Verge of Insanity

On the Verge of Insanity is a 2021 South Korean television series starring Jung Jae-young, Moon So-ri, Lee Sang-yeob and Kim Ga-eun. It aired on MBC TV from June 23 to August 26, 2021 for 16 episodes.

Synopsis
It follows the story of middle-aged office workers struggling to survive in a turbulent workplace.

Main

 * Jung Jae-young as Choi Ban-seok, a developer in the home appliance division of Hanmyung Electronics. Although he is a veteran engineer, he ends up joining the HR team after a series of ups and downs.
 * Moon So-ri as Dang Ja-young, the workaholic head of HR team who is respected by her juniors for her outstanding leadership and is trusted by her superiors for her mental agility.
 * Lee Sang-yeob as Han Se-kwon, the development team leader who is related to the company group's owner.
 * Kim Ga-eun as Seo Na-ri, the deputy of the planning team.

People in research building

 * Kim Nam-hee as Shin Han-soo
 * Ahn Nae-sang as Noh Byung-guk
 * as Gong Jung-pil
 * Park Won-sang as Peng Su-gon
 * as Ki Jung-hyun
 * Baek Min-hyun as Ahn Jun-soo
 * as Go Jung-sik
 * as Pyun Dong-il

People in office building

 * Cha Chung-hwa as Kim Jung-ah
 * as So Sang-wook
 * as Gye Bo-ram
 * as Bae Jung-tak
 * as Oh Jae-il

People in headquarters

 * as Han Seung-gi
 * Kang Ju-sang as Noh Jae-yeol
 * Kang Yeon-woo as Park Hoon-jung

Extended

 * Jung Sung-hoon as Yoon Gi-joon
 * Kim Yoon-seo as Jung Sung-eun
 * Kim Ye-eun as Oh Hye-yeon
 * Jung Yeo-jun as Gil Chang-hwan
 * Yoo Jung-rae as Eo Hae-mi
 * Kim Seon-ah as Kim Seul-ah
 * Oh Yu-na as Heo Ga-young

Production
The first script reading of the cast was held at Changwon International Hotel. The series is set in South Gyeongsang Province and cast a large number of locals from that area in minor roles.