When 당신 answer the 질문 "Who are you?" with "No One" in caps for a long enough time, being No One takes on an identity of its own. In Arya's case it means trying and failing the same rigorous test 의해 the waif time and time again.
The 20-year-old rising 별, 스타 discusses landing her first pro gig, the part of Sansa Stark, at 13, growing up in the public eye ("It can really get 당신 down") and Sansa's season-six evolution ("She really showed people what she could do").