WHAT IT'S ABOUT "Baby Reindeer" creator Richard Gadd returns with "Half Man," a six-part series about the decades-long dysfunctional relationship between two men who grew up together because their mothers were a couple. The six-part series begins with a violent act on the wedding day of Niall Kennedy (Jamie Bell), as he reunites with Ruben Pallister (Gadd). It traces the evolution of their relationship throughout their tumultuous teenage and college years and beyond.