This adds realism to the stories shown on screen while Chicago Fire is broadcast, but what some fans might not know is that ...

Conway: What are the greatest joys for you, as well as the challenges, to join an existing series like Chicago Fire and working alongside this longtime cast & crew these 13 seasons in? Mulroney ...

But here’s what really makes it special: Chicago Fire doesn’t rely on the same cast forever to stay good. The lineup has changed as often as the coffee supply, but the show keeps thriving.