Yen Hui, also named Yen Tsu-yuan(子淵) or Yen Yuan(顏淵), was one of Confucius students. He was born in the kingdom of Lu during the Spring and Autumn Period of Chou Dynasty. Being a bright and earnest person, he learned much from studying only one thing. Yen Hui was renown because he did not take his anger out at others nor did he ever commit the same mistake twice. Confucius placed him at the top of those who were honored for the virtuous personalities. Yen's life was austere and simple. He lived in narrow, dirty alleys and always was lacking in food and drink. Others would distress under such pressure, but he remained steadfast, satisfied to lead a simple and virtuous life. His hair turned gray at the age of twenty-nine from overwork and malnutrition. It is said he died at thirty-two , but he was always remembered by following generations as the Fu Sage.

Reference:《THE BRIEF BIOGRAPHIES OF THE SAINTS AND SAGES ARE IN THE TA CHENG HALL OF THE CONFUCIUS TEMPLE》published by Taipei Confucius Temple Governing Board