The play mainly tells the story of the emergency rescue team of Chicago Fire Station 51. This group of heroic consumer team members include: Deputy Captain Kelly (Taylor Kinney), Captain Walter (Eamonn Walker), Paramedic Gabriella (Monica Raymund), who is very loyal to his work, veteran firefighter Christopher (David Eigenberg), life-threatening firefighter Matthew (Jesse Spencer), and prospective firefighter Peter (Charlie Barnett). This group of brave and fearless men and women rushed into the most dangerous places without hesitation, dealing with death every day, making the most important choices at the most tense moments, and facing the test of self-esteem and arrogance every day. The responsibility and pressure of work have a huge impact on their personalities...