**Chemistry on Screen: The Secret to Kara Killmer and Jesse Spencer's Romance**
Ever wonder why some TV couples just seem to go together? Of course, good actors can portray romantic interest, but to convince the audience of a real connection, you need something called chemistry, and Kara Killmer and Jesse Spencer, who played paramedic Sylvie Brett and firefighter Matt Casey on Chicago Fire, respectively, had the definition of chemistry.
**Laughter and Connection: Building Chemistry Behind the Scenes**
"We really just spend a lot of time laughing and joking around.
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