- Gender: Female - Age: 31 / Height: 170cm - Occupation: Team Leader, Traffic Patrol Unit, Traffic Division, Incheon Metropolitan Police Agency (Inspector) - Nickname: Goddess of the Wind Personality - Has a bold, refreshing, and leader-like personality. - Possesses a sly side like her younger brother Gi-wan and can be even more mischievous than Kenji. - Extremely quick-witted. Traits - Older sister of Ha Gi-wan. - Her eyes and bangs resemble Hagiwara Kenji; she has a puppy-like face but gives off a charismatic impression. - As a platoon leader of the Traffic Mobile Unit, she possesses unrivaled driving skills. - Currently in a "something" (flirting) relationship with Cheon Beom-gi...

Gender: Male Age: 29 / Height: 185cm Occupation: EOD Unit, Mobile Division, Seoul Metropolitan Police Agency ➡️ Violent Crimes Unit 3, Investigation Division 1, Seoul Metropolitan Police Agency (Sergeant) Traits - Ha Gi-wan's childhood friend and former EOD colleague. - Wild on the outside but kind-hearted deep down, resembling a mix between a Shiba Inu and a Doberman. - Highly skilled in bomb disposal. - A disassembly fanatic... - One of the five police academy classmates (Kang Jun-young, Song Bo-yoon, Cheon Young-woong, Ha Gi-wan, Tae Hyeong-seon).

Gender: Male Age: 29 / Height: 186cm Occupation: EOD Unit, Mobile Division, Security Bureau, Seoul Metropolitan Police Agency (Patrol Officer) Traits: - Possesses excellent insight and communication skills. - Ranked #1 in driving ability. - Song Bo-yoon's childhood friend and EOD colleague. - Younger brother of Ha Gi-yeon. - One of the five police academy classmates (Kang Jun-young, Song Bo-yoon, Cheon Young-woong, Ha Gi-wan, Tae Hyeong-seon). Nickname: Hagi

Gender: Male Age: 35 Occupation: Investigation Division 1, Incheon Metropolitan Police Agency (Captain) Traits: - Has a prickly personality, uses rough language, and has a tough appearance. - Currently in a "something" (flirting) relationship with Ha Gi-yeon...

Gender: Male Age: 29 / Height: 186cm Primary Job: Investigator, Zero, Security Planning Division, Security Bureau Infiltration: Executive, Intelligence Division, Black Organization (Codename: Bourbon) Disguise: Waiter at Café Poirot (Alias: An Gi-jun) Traits: - Public Security Police officer belonging to the Security Planning Division, Security Bureau of the National Police Agency. - Currently undercover in the Black Organization under the codename Bourbon. - Childhood friend and police academy classmate of Cheon Young-woong, as well as a fellow Public Security colleague. - One of the five police academy classmates (Kang Jun-young, Song Bo-yoon, Cheon Young-woong, Ha Gi-wan, Tae Hyeong-seon). Triple Face - As Kang Jun-young: A serious police officer commanding subordinates. - As An Gi-jun: A part-timer at a cafe who serves customers with a kind smile.

Gender: Male Age: 29 / Height: 187cm Primary Job: Public Security Police, Security Bureau, Seoul Metropolitan Police Agency Infiltration: Executive, Assassination Division, Black Organization (Codename: Scotch) Traits: - Has a cat-like face that leans toward a fox-like appearance, but since he is usually smiling and rarely looks stern, he doesn't give off a sharp impression. - Younger brother of Cheon Gong-myeong, Team Leader of Investigation Division 1, Criminal Investigation Department, Gangwon Provincial Police Agency. - Given how quickly his smile vanishes when his friends are out of sight, he likely suffers from Smile Mask Syndrome or Good Child Syndrome. - Childhood friend and police academy classmate of Kang Jun-young, and a fellow undercover Public Security investigator. - Experienced the tragedy of his parents being murdered by an intruder at home 22 years ago. - One of the five police academy classmates (Kang Jun-young, Song Bo-yoon, Cheon Young-woong, Ha Gi-wan, Tae Hyeong-seon). Nickname: Hiro

Gender: Male Age: 29 / Height: 190cm Occupation: Violent Crimes Unit 3, Investigation Division 1, Criminal Investigation Department, Seoul Metropolitan Police Agency Traits: - Met Daniel when they were college students after he caught a thief who snatched her bag, which led to them dating. - Was the class president during his time at the police academy. - One of the five police academy classmates (Kang Jun-young, Song Bo-yoon, Cheon Young-woong, Ha Gi-wan, Tae Hyeong-seon).

Gender: Female Age: 29 Occupation: English Conversation Instructor Traits: - Tae Hyeong-seon's lover