Inspector Koo

Inspector Koo is a 2021 South Korean television series starring Lee Young-ae in the title role, alongside Kim Hye-jun, Kim Hae-sook, Kwak Sun-young, Baek Sung-chul and Cho Hyun-chul. The series is about the battle of a former police officer against a female college student who is a serial killer. It aired on JTBC from October 30 to December 12, 2021, every Saturday and Sunday at 22:30 (KST). It is also available for streaming on Netflix in selected regions.

Synopsis
It follows the story of Koo Kyung-yi (Lee Young-ae), whose world is all about games and alcohol, as she digs into a mysterious serial murder case completely disguised as an accident.

Main

 * Lee Young-ae as Koo Kyung-yi, an intelligent policewoman-turned-insurance investigator in her 40s who investigates a murder case.
 * Kim Hye-jun as K / Song Yi-kyung (real name), a mysterious college student and a passionate amateur theater actress.
 * Kim Hae-sook as Yong Sook (Director Yong), the director of a foundation.
 * Kwak Sun-young as Na Je-hee, the head of NT Life Insurance's investigation team.
 * Baek Sung-chul as Santa / Han Kwang-wook, Kyung-yi's assistant.
 * Cho Hyun-chul as Oh Kyung-soo, an investigator at NT Life Insurance.

People around K

 * Lee Hong-nae as Geon-wook, K's supporter.
 * Bae Hae-sun as Jung-yeon, K's aunt.

People around Director Yong

 * Jung Seok-yong as Manager Kim
 * Choi Dae-chul as Heo Sung-tae, Director Yong's eldest son.
 * Park Ji-bin as Heo Hyun-tae, Director Yong's second son.

Extended

 * Choi Young-joon as Jang Seong-woo, a high school theater teacher.

Special appearances

 * Kim Kang-hyun (actor) as Kim Min-gyu
 * Park Ye-young as Yoon Jae-young
 * Park Kang-seop as Dae-ho
 * Shin Yoon-seop as Park Gyu-il
 * Kim Soo-ro as Gotham
 * Ahn Shin-woo as Security team leader

Production

 * Early working title of the series is Incredible Koo Kyung-yi.
 * The first script reading of the cast was held in May 2021, and filming started the next month.