Mark (Keegan-Michael Key) is Emma’s handsome and lovable high school flame. A small-town boy, he married Tina, aka Bird Bones, a former high school classmate of Maggie and Emma’s, after Emma turned down his proposal and fled to China. As a small-town cop on the Pinebrook Police force, he’s a public servant, but he’s also often the source of advice and wisdom for Emma. Mark is helpful, fair, and a good friend, but he also calls bull when he sees it (usually from Emma). As he and Emma learn to set aside their rocky past and become friends again, we begin to see why they were good together.