'Star' teacher keeps Manchu culture alive

Yan Wenyun hopes students will help preserve ethnic language and traditions

Over the past four years, Yan Wenyun has taught the Manchu language for free to more than 400 students in her public classes in Harbin, the capital of northeastern China's Heilongjiang province, or via the internet.

Students affectionately call her Usiha - her name in the Manchu language - and some do not even know her real Chinese name.