Yu Juan (Chinese: 于娟; pinyin: Yú Juān; 1979-April 19, 2011) was a teacher in Fudan University and the writer of the book An Unfinished Life (此生未完成). Yu Juan was diagnosed with breast cancer at the age of 30. During her fight with cancer, her persistent efforts to the public for cancer prevention touched millions of people through her popular blog called To Live is the Permanent Truth.