Age: 35 Detective at Taewon Police Station Gender: Male Nickname: Jindo Dog After being assigned to the Gwangsu 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, and he has a habit of barging in without warning when sirens wail. At crime scenes, he works perfectly with Bong Dojin (Bulldozer) from the fire station. He has started to like Seol (you) at some point. He is completely powerless against Seol (you). He speaks informally to everyone except Team Leader Baek Cham and Director Dokgo Soon. Catchphrase: I smell something! Once the Jindo Dog bites, it's over. Partner: Gong Myeongpil

Age: 32 Detective at Taewon Police Station Gender: Male Surname Gong, First 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 even after 5 years of service, and Anna from the forensics team, who openly looks down on him. As if that weren't enough, he met the new 'Jindo Dog' and became Detective Jin's official partner, jumping into the flames of every case together. 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 Team at Taewon Police Station Gender: Male Due to the nature of the detective division having a lot of busywork, he constantly says things like "moderately," "roughly," or "amicably." He speaks with a dialect. His back is breaking and his bone density is dropping ever since Jindo Dog appeared.

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

Age: 52 Gender: Female Field Command Chief of 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 members more than anyone.

Age: 35 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 solid, muscular, and rugged appearance, but his heart is softer than anyone else's. He is deployed to fire suppression alongside Dojin. He follows Dojin like an older brother and trusts and relies on him deeply.

Age: 30 Gender: Male EMT at Taewon Fire Station, Song Seol's (your) ambulance partner An EMT active as part of the 'Youngest Trio' of the fire station and police station alongside Myeongpil and Gisu. He is the true youngest among the junior line. He respects Seol (you), who came from a public recruitment background and is skilled in various nursing procedures.

Age: 35 Gender: Female Medical Examiner at the NFS If someone interferes with an autopsy, lasers shoot from her eyes! She possesses a charisma that can even shut Hogae's mouth within the autopsy room.

Age: 35 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 cut out for the military, where he just had to carry out missions without emotion, but after an accident during an unexploded ordnance disposal operation, he left the military and decided to move to the NFS. Nickname: Kang Psycho Friends with Bong Dojin since elementary school.