Kim Hyun-woo (M, 33) | Rank: Inspector (Team Leader) - Reddish-brown hair - (Father: Commissioner Kim Jin-ho / Mother: Senior Superintendent Kim Eun-young) (Younger sister: Kim Hyun-mi / Nephew: Oh Seung-yoon) (Wife: Seo Seung-hee, Cyber Crime Investigation) Lee Ji-hye (F, 32) | Rank: Lieutenant (Assistant Team Leader / Senior Investigator) - Purple hair Song Jin-woo (M, 31) | Rank: Lieutenant Park Eun-bin (F, 30) | Rank: Sergeant Kang Yoon-jae (M, 30) | Rank: Sergeant Yoo Jin-ah (F, 29) | Rank: Corporal Park Chul-min (M, 29) | Rank: Corporal Yoo Hyun-jin (F, 28) | Rank: Corporal Park Yong-jin (M, 28) | Rank: Corporal Kim Ji-min (F, 27) | Rank: Officer Kim Yong-min (M, 27) | Rank: Officer Lee Yeon-hee (F, 26) | Rank: Officer Lee Jae-sung (M, 26) | Rank: Officer Yoon Bo-mi (F, 25) | Rank: Officer Choi Tae-hoon (M, 25) | Rank: Officer

Kim Hyun-mi (F, 33) | Rank: Inspector (Team Leader) - Orange-brown hair - (Father: Commissioner Kim Jin-ho / Mother: Senior Superintendent Kim Eun-young) (Older brother: Kim Hyun-woo) (Nephew: Oh Seung-yoon) Yang Hyun-jong (M, 31) | Rank: Lieutenant (Assistant Team Leader) Lee Seul-i (F, 30) | Rank: Sergeant (Husband: Yoo Ji-ho) Kang Young-tae (M, 30) | Rank: Sergeant Song Yeon-mi (F, 30) | Rank: Sergeant - Pink hair Lee Seok-hyun (M, 29) | Rank: Corporal (Wife/Childhood friend: Lee So-young) Lee Ha-yeon (F, 29) | Rank: Corporal Park Hyun-kyu (M, 28) | Rank: Corporal Ko Eun-min (F, 28) | Rank: Corporal Lee Min-ho (M, 27) | Rank: Officer - Black hair, gail cut Shin Yoon-ri (F, 27) | Rank: Officer Choi Soo-jong (M, 26) | Rank: Officer Yang Young-mi (F, 26) | Rank: Officer Kim Jong-min (M, 25) | Rank: Officer Lee Han-sol (F, 25) | Rank: Officer

Yoo Ji-ho (M, 32) | Rank: Lieutenant (Team Leader or Squad Leader) - Light green hair - (Wife: Lee Seul-i) Kim Yeon-jae (F, 29) | Rank: Sergeant - Yellow hair Oh Seung-yoon (M, 28) | Rank: Corporal - Brown hair - (Childhood friend: Kim Min-seo) [Ever since I was young, my only wish was to become a police officer. Started as a 25-year-old officer at Haeundae for 2 years, now in his 4th year at the Busan Agency Detective Division. Entrusted by biological mother Kim Eun-young at age 5 to his new family, adoptive mother Senior Superintendent Lee Da-hee] Kim Min-seo (F, 28) | Rank: Corporal - Red hair - (Childhood friend: Oh Seung-yoon) [Started as a 25-year-old officer at Haeundae for 2 years, now in her 4th year at the Busan Agency Detective Division] Kim Yong-chul (M, 29) | Rank: Sergeant Seo Ye-eun (F, 28) | Rank: Corporal (Boyfriend: Kim Jung-min) Lee Myung-hak (M, 28) | Rank: Corporal Yoo Jin-hee (F, 27) | Rank: Officer Lee So-young (F, 30) | Rank: Sergeant (Assistant Team Leader) - Blue hair - (Husband/Childhood friend: Lee Seok-hyun) Kim Hee-chul (M, 28) | Rank: Corporal Lee Yoon-young (F, 26) | Rank: Officer Kang Ho-dong (M, 27) | Rank: Officer Kim Tae-won (M, 26) | Rank: Officer Park Ye-jin (F, 25) | Rank: Officer Lee Soo-geun (M, 25) | Rank: Officer

Lee Young-ho (M, 41) | Rank: Inspector (Division Head or Section Chief) - White-khaki hair Park Tae-sung (M, 30) | Rank: Sergeant - Yellow hair Seo Seung-hee (F, 33) | Rank: Lieutenant (Assistant Team Leader / Senior Analyst) - Orange hair in a ponytail - (Husband: Kim Hyun-woo) Lee Tae-min (M, 28) | Rank: Corporal Yoo Sung-min (M, 25) | Rank: Officer Kim Jung-min (M, 27) | Rank: Corporal (Girlfriend: Seo Ye-eun) Lee Ha-na (F, 29) | Rank: Sergeant Shin Mi-young (F, 28) | Rank: Corporal - Short green hair Park Soo-jung (F, 27) | Rank: Officer - Short orange hair Kim Mi-jin (F, 25) | Rank: Officer

Kim Jin-ho (M, 63) | Rank: Commissioner General (Regional Police Chief) (Wife: Senior Superintendent Kim Eun-young) (Children: Son Kim Hyun-woo / Daughter Kim Hyun-mi) Kim Eun-young (F, 61) | Rank: Senior Superintendent (Deputy Chief or Department Head) (Husband: Commissioner Kim Jin-ho) (Children: Son Kim Hyun-woo / Daughter Kim Hyun-mi) [Entrusted her biological son Oh Seung-yoon at age 5 to her junior, Senior Superintendent Lee Da-hee] Lee Da-hee (F, 55) | Rank: Senior Superintendent (Investigation Department Head or Deputy Chief) (Adoptive son: Oh Seung-yoon) (Senior to Kim Eun-young) Choi Hyun-bin (M, 53) | Rank: Senior Superintendent (Public Safety Department Head or Public Peace and Foreign Affairs Department Head) Lee Young-ho (M, 52) | Rank: Superintendent (Inspection and Audit Officer or Public Relations Officer)