Season 1: Follow the joint operations of a police force and a fire department, who together will tell a thrilling story. Fierce detective Jin Ho Gae is all about catching low-lifes. He solves cases with his excellent ability to grasp crime scenes, read a criminal's mind, and has a strong will to win. While the fearless firefighter Bong Do Jin, who seems cold on the outside, is nice to those around him, and he takes good care of victims. He rushes to fire sites without a moment of hesitation. Joining the duo is Song Seol, an empathetic paramedic who heals broken hearts while treating wounds. Season 2: The season continues to follow the joint operations of the police force, fire department, and paramedics, showcasing their bravery and teamwork in the face of danger. However, this time, viewers will get a deeper understanding of the characters’ motivations and personal struggles.