Kim Hyun-mi (F) / 31, Inspector (Team Leader) (Sister of Kim Hyun-woo in Organized Crime Team / Daughter of Kim Eun-young, former Narcotics Division Senior Superintendent / Step-daughter of Commissioner Lee Young-ho / Daughter of Kim Jin-ho, who died in the line of duty in 2015 / Aunt of Oh Seung-yoon, whose real name is Kim Hyun-jae) Kang Young-tae (M) / 30, Sergeant (Assistant Team Leader) Yoon Bo-mi (F) / 28, Corporal (Girlfriend of Lee Tae-min) Lee Jae-seong (M) / 30, Sergeant Lee Ji-hye (F) / 27, Officer Kim Seok-jun (M) / 29, Corporal Park Soo-jung (F) / 27, Officer Park Chul-min (M) / 30, Sergeant

Kim Hyun-woo (M) / 33, Captain (Team Leader) (Brother of Kim Hyun-mi in Narcotics Division / Son of Kim Eun-young, former Narcotics Division Senior Superintendent / Step-son of Commissioner Lee Young-ho / Son of Kim Jin-ho, who died in the line of duty in 2015 / Husband of Seo Seung-hee / Uncle of Oh Seung-yoon, whose real name is Kim Hyun-jae) Kim Yeon-jae (F) / 29, Corporal Yang Hyun-jong (M) / 28, Corporal Lee Yeon-hee (F) / 31, Inspector (Assistant Team Leader) (Childhood friend of Kim Tae-won) Park Hyun-kyu (M) / 30, Sergeant Kim Mi-jin (F) / 27, Officer Lee Seok-hyun (M) / 30, Sergeant Seo Ye-eun (F) / 31, Inspector

Kim Min-seo (F) / 27, Officer (Childhood friend of Oh Seung-yoon) Yoo Ji-ho (M) / 32, Inspector (Team Leader) (Husband of Lee Seul-yi) Lee So-young (F) / 29, Sergeant (Assistant Team Leader) Oh Seung-yoon (M) / 27, Corporal (Childhood friend of Kim Min-seo / Foster son of Senior Superintendent Lee Da-hee of Seoul Agency / Biological son of Senior Superintendent Kim Eun-young) Lee Ha-na (F) / 28, Corporal Yoo Seong-min (M) / 27, Officer Oh Yeon-seo (F) / 29, Sergeant Kim Jun-ho (M) / 28, Corporal

Lee Min-ho (M) / 34, Captain (Team Leader) Yoo Hyun-jin (F) / 30, Sergeant Lee Tae-min (M) / 28, Corporal (Boyfriend of Yoon Bo-mi) Lee Seul-yi (F) / 31, Inspector (Assistant Team Leader) (Wife of Yoo Ji-ho) Park Yong-jin (M) / 27, Officer Song Yeon-mi (F) / 28, Corporal Kim Jung-min (M) / 31, Inspector Choi Ji-yoon (F) / 29, Sergeant

Seo Seung-hee (F) / 33, Captain (Team Leader) (Wife of Kim Hyun-woo) Park Tae-seong (M) / 29, Sergeant Lee Ha-yeon (F) / 26, Officer Kim Tae-won (M) / 31, Inspector (Assistant Team Leader) (Childhood friend of Lee Yeon-hee) Kim Ji-min (F) / 29, Corporal

Lee Young-ho (M) / 62, Chief Superintendent General (Commissioner) (Former partner of the late Kim Jin-ho / Protects Kim Eun-young after their remarriage) Cho Won-hee (F) / 59, Senior Superintendent General (Deputy Commissioner) (Aunt of siblings Kim Hyun-woo and Kim Hyun-mi) Choi Hyun-bin (M) / 55, Senior Superintendent General (Director of Investigation Bureau) Kim Eun-young (F) / 49, Senior Superintendent (Director-level) Investigation Planning Coordinator (Widow of Kim Jin-ho who died in 2015 / Remarried to Commissioner Lee Young-ho / Mother of Kim Hyun-woo and Kim Hyun-mi / Senior to Senior Superintendent Lee Da-hee / Biological mother of Oh Seung-yoon, real name Kim Hyun-jae) [Entrusted 5-year-old son Oh Seung-yoon to Lee Da-hee, who is now Investigation Bureau Director] Jung Hyung-don (M) / 52, Superintendent (Division Head) Head of Criminal/Investigation Division