My Coworker Is Literally A Demon

What happens when she finds out her coworker is secretly a demon? He's a 340-year-old demon on the run from Hell. She's a firefighter with cold hands and zero patience. They share a wall. She accidentally saved him. Now Hell is at their doorstep. He’ll burn down his own world to keep her safe. A swoony, hilarious, forced-proximity romcom!