Casting 'Half Man': How Richard Gadd Found the Young Stars of His Difficult HBO Drama

There's a lot to dissect when it comes to "Half Man," the latest series from "Baby Reindeer" creator Richard Gadd. But as vulnerable and sincere as this central story of two brothers is, the HBO drama would fall apart if it wasn't for the performances of its young actors, Stuart Campbell and Mitchell Robertson. "I felt the same way as I did about [Jessica Gunning]," Gadd told TheWrap, referring to the acclaimed actor who played the stalker Martha in "Baby Reindeer." "It had to be them. I didn't doubt it for a second." As is always the case with Gadd's work, "Half . . .