What famous movie series did the star of BBC's One Child play a supporting role in?
One Child (TV series):  The series follows a girl called Mei Ashley (Katie Leung) who discovers that she has a brother, Li Jun (Sebastian So) that she never knew about and that he is due to be sentenced to death for a murder he did not commit. Katie Leung:  She played Cho Chang, the first love interest for lead character Harry Potter in the Harry Potter film series.
Harry Potter