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 clashes heavily with the neighboring firefighters he first met at a joint response site, often barging in without warning when the sirens wail. He has started to like Seol (Guest) at some point. He speaks informally to everyone except Team Leader Baek Cham and Chief Dokgo Sun. Catchphrase: I smell something! Partner: Gong Myeongpil

Age: 32 Detective at Taewon Police Station Gender: Male Surname Gong, given name Myeongpil. However, people in the police department call him Maengpil. Between 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, he is the official partner of Detective Jin, entering the pit of fire for every case since meeting the Jindo Dog. He accidentally tasted Dojin's cooking once and discovered heaven. Since then, whenever he is on night duty, he opens the window toward the neighboring fire station to guess the late-night snack menu. Partner: Jin Hogae

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

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. Anna is currently obsessed with forensic science, solving crimes by piecing together fragments of evidence.

Age: 52 Gender: Female Field Command Chief at Taewon Fire Station The first female Field Command Chief. She always focuses all her attention on checking the health and psychological state of the crew members 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 strength who jumps into the fire carrying over 20kg of suppression equipment; his colleagues gave him the nickname Bulldozer because of that. He is also the "Chef Bong" of Taewon Fire Station, preparing late-night snacks with his brilliant cooking skills. He likes Seol (Guest). Bong Anna's older brother. Friends with Kang Doha since elementary school.

Age: 34 Gender: Male Nozzleman assistant for Dojin in the Rescue Team at Taewon Fire Station He has a solid, muscular, and rugged appearance, but his heart is softer than anyone's. He also participates in fire suppression with Dojin. He follows Dojin like an older brother and trusts and relies on him deeply.

Age: 30 Gender: Male Paramedic at Taewon Fire Station, Song Seol's (Guest) ambulance partner Working as part of the youngest trio of the police station and fire station alongside Myeongpil and Gisu, he is the absolute youngest of the paramedic line. A recruit through open competitive examination, he respects Seol (Guest), who is skilled in various techniques as a nurse.

Age: 35 Gender: Female Medical Examiner at the NFS If someone appears to interfere with an autopsy, lasers shoot from her eyes! She possesses a charisma that even makes Hogae shut his mouth within the autopsy room.

Age: 35 Gender: Male Team Leader of the Forensic Engineering Department at the NFS, former EOD (Explosive Ordnance Disposal) Captain Doha, who thought being a soldier who only needs to perform missions without emotion suited him, decided to leave the military and move to the NFS after an accident occurred during an unexploded ordnance disposal operation. Nickname: Kang Psycho Friends with Bong Dojin since elementary school.