Yoo Ji-ho M (32) / Inspector (Team Leader) -Light green hair- (Husband of Lee Seul-yi) Kim Yeon-jae F (29) / Assistant Inspector -Yellow hair- Oh Seung-yoon M (28) / Assistant Inspector -Brown hair- (Childhood friend of Kim Min-seo) [Since I was young, my only wish was to become a police officer. After starting as a 25-year-old officer at Guwol Precinct, he is now in his 4th year at the Incheon Agency's Criminal Affairs Division. He is unaware that Oh Jeong-taek died in the line of duty during an organized crime investigation in 2013. He was sent for adoption at age 5 and raised by a new adoptive family. Commissioner Kim Eun-young (63) is his biological mother, but she does not realize he resembles Oh Jeong-taek's son. He has been active for 4 years.] Kim Min-seo F (28) / Assistant Inspector -Red hair- (Childhood friend of Oh Seung-yoon) [Started as a 25-year-old officer at Guwol Precinct, now in her 4th year at the Incheon Agency's Criminal Affairs Division.] Kim Yong-cheol M (29) / Assistant Inspector Seo Ye-eun F (28) / Assistant Inspector (Girlfriend of Kim Jung-min) Lee Myeong-hak M (28) / Assistant Inspector Yoo Jin-hee F (27) / Assistant Inspector Lee So-young F (30) / Senior Inspector (Deputy Team Leader) -Blue hair- (Childhood friend and wife of Lee Seok-hyun) Kim Hee-chul M (28) / Assistant Inspector Lee Yoon-young F (26) / Officer Kang Ho-dong M (27) / Assistant Inspector Kim Tae-won M (26) / Officer Park Ye-jin F (25) / Officer Lee Soo-geun M (25) / Officer

Lee Ji-hye F (34) / Senior Inspector (Team Leader) -Orange brown hair- (Daughter of Senior Superintendent General Lee Da-hee) Kim Hyun-woo M (33) / Senior Inspector -Reddish brown hair- (Husband of Seo Seung-hee) Lee Seul-yi F (30) / Senior Inspector (Wife of Yoo Ji-ho) Yang Hyeon-jong M (29) / Assistant Inspector Song Yeon-mi F (32) / Senior Inspector -Purple hair- Kang Young-tae M (28) / Assistant Inspector Lee Seok-hyun M (30) / Senior Inspector (Childhood friend and husband of Lee So-young) Lee Ha-yeon F (29) / Assistant Inspector Lee Jae-seong M (29) / Assistant Inspector Ko Eun-min F (28) / Assistant Inspector -Pink hair- Park Hyun-kyu M (29) / Assistant Inspector Lee Min-ho M (31) / Senior Inspector -Black hair with gail cut- Yoo Hyun-jin F (27) / Assistant Inspector Park Chul-min M (28) / Assistant Inspector Kim Ji-min F (30) / Assistant Inspector Park Yong-jin M (27) / Officer Lee Yeon-hee F (26) / Officer Kim Yong-min M (26) / Officer Yoon Bo-mi F (25) / Officer Choi Tae-hoon M (25) / Officer

Lee Young-ho M (41) / Senior Inspector (Division Head/Section Chief) -White khaki hair- Park Tae-seong M (30) / Senior Inspector -Yellow hair- Seo Seung-hee F (33) / Senior Inspector -Orange hair in a ponytail- (Wife of Kim Hyun-woo) Lee Tae-min M (28) / Assistant Inspector Yoo Seong-min M (25) / Officer Kim Jung-min M (27) / Assistant Inspector (Boyfriend of Seo Ye-eun) Lee Ha-na F (29) / Assistant Inspector Shin Mi-young F (28) / Assistant Inspector -Green bob cut- Park Soo-jung F (27) / Officer -Orange bob cut- Kim Mi-jin F (25) / Officer

Kim Eun-young F (63) / Chief Superintendent Guidance (Incheon Police Commissioner) -Brownish red hair- (Remarried to Kang Dae-hyeop) (Former junior of Lee Da-hee in Narcotics) (Children: 1 son, 1 daughter—Eun-mi 27, Eun-won 25) [Her husband Oh Jeong-taek died in the line of duty in 2013. After losing him, she sent her son Oh Seung-yoon for adoption at age 5. She does not realize that Seung-yoon, now in his 4th year in the Criminal Affairs Division, resembles Jeong-taek.] Kang Dae-hyeop M (65) / Prosecutor General (Seoul Prosecution Service) -Grey black hair- (Remarried to Kim Eun-young) (Children: 1 son, 1 daughter—Eun-mi 27, Eun-won 25) ------------------------------------------------ Choi Hyun-bin M (59) / Chief Superintendent (Deputy Commissioner of Incheon Police) -White black hair- Lee Da-hee F (58) / Senior Superintendent General (Department Head of Incheon Police) -Brown khaki hair- (Mother of Lee Ji-hye in MIU) (Former senior of Kim Eun-young in Narcotics) Jung Jin-woo M (55) / Superintendent (Incheon Police Investigation Division Head) Park Hye-ran F (53) / Senior Superintendent General (Department Head of Incheon Police)