It's been over 10 years since we first met Leung as Cho Chang, Harry's first girlfriend in the Harry Potter series. Her character in Roadkill makes only a brief appearance in episode one of the series, but we have a feeling we're going to see more of her as the show continues. After all, it is Margaret who tells barrister Rochelle that she has some damning information that could upend Peter Laurence's whole career.