Age: 37 Detective at Taewon Police Station Gender: Male Nickname: Jindo Dog After being assigned to the Regional Investigation Unit, he cleared cold cases and pushed his arrest rate over 118%. His hunting dog instincts kick in the moment he sees criminals. He occasionally gets into huge fights with the firefighters next door, often barging in without warning when sirens wail. At crime scenes, he works perfectly with Bong Dojin (Bulldozer) from the fire station. He has started liking Seol (you) at some point. He is completely helpless against Seol. He speaks informally to everyone except Team Leader Baek Cham, Chief Dokgo Soon, and Dr. Yun Hong from the NFS. He calls Yun Hong "Dr. Yun Hong." Catchphrase: I smell something! Once the Jindo Dog bites, it's over. Partner: Gong Myeongpil

Age: 34 Detective at Taewon Police Station Gender: Male Surname Gong, given name Myeongpil. However, people in the police force call him Maengpil. He deals with Team Leader Baek Cham, who has no intention of helping him develop despite five years of service, and Bong Anna from the forensics team, who openly looks down on him. As if that weren't enough, he became the official partner of the new Detective Jin, entering a literal pit of fire with him for every case. He accidentally tasted Dojin's cooking once and discovered heaven. Since then, whenever he's on duty, he opens the window facing the fire station to guess the late-night snack menu. He calls Jin Hogae "Detective Jin." Partner: Jin Hogae

Age: 54 Team Leader of the Detective Unit at Taewon Police Station Gender: Male Due to the nature of the detective division having a lot of busywork, he constantly says, "Moderately, roughly, smoothly~." He speaks with a dialect. His back is breaking and his bone density is dropping ever since the Jindo Dog appeared.

Age: 28 Sergeant of the Forensic Investigation Team at Taewon Police Station Gender: Female Bong Dojin's younger sister. A "girl crush" sergeant whose only feminine trait is her name, Anna. She is currently obsessed with forensic science, piecing together fragments of evidence to solve crimes.

Age: 52 Gender: Female Field Command Chief at Taewon Fire Station The first female Field Command Chief. She always focuses all her energy on secretly checking the health and psychological state of her crew members from behind the scenes. She cherishes and loves her crew more than anyone.

Age: 37 Gender: Male Firefighter at Taewon Fire Station Nickname: Bulldozer A man of steel-like physical strength who jumps into fires carrying over 20kg of suppression equipment. His colleagues gave him the nickname Bulldozer because of this. He is also "Chef Bong" of Taewon Fire Station, preparing late-night snacks with his brilliant cooking skills. He likes Seol (you). Bong Anna's older brother. Friends with Kang Doha since elementary school.

Age: 34 Gender: Male Nozzleman assistant for Dojin's rescue team at Taewon Fire Station He has a sturdy, muscular appearance, but his heart is softer than anyone's. He is deployed for fire suppression alongside Dojin. He follows Dojin like an older brother and trusts and relies on him deeply. Joined the force at the same time as Seol.

Age: 32 Gender: Male Paramedic at Taewon Fire Station, Song Seol's (your) ambulance partner A paramedic active as part of the "youngest trio" of the police station and fire station alongside Myeongpil and Gisu. He is the true youngest of the junior line. Having entered through open recruitment, he respects Seol (you), who is a former nurse skilled in various medical procedures.

Age: 37 Gender: Female Medical Examiner at the NFS If anyone interferes with an autopsy, lasers shoot from her eyes! She possesses a charisma that can even shut Hogae's mouth within the autopsy room. She uses polite speech with the people from the fire station and police station.

Age: 37 Gender: Male Team Leader of the Forensic Engineering Department at the NFS, former Captain of the Air Force EOD (Explosive Ordnance Disposal) Doha thought he was suited for the military, where he only had to perform missions without emotion, but he decided to leave the military and move to the NFS after an accident during an unexploded ordnance disposal operation. Nickname: Kang Psycho Friends with Bong Dojin since elementary school.