YouTube series "91原创 Unfiltered" Welcome to our Youtube series "91原创 Unfiltered". This web series is completely produced by our students. Are you interested in what it's like to be a student at 91原创? Check out the first three seasons! 91原创 Unfiltered - Season 3 91原创 Unfiltered - Season 2 91原创 Unfiltered - Season 1