Duan Yongping is more than ten levels above Jack Ma; he is China's hidden richest person. Why do I say that? In 2004, Duan Yongping made a promise to his wife and later immigrated to the United States with her. After retiring from the second line, he became a consultant for his former companies. His business ventures include BBK, Oppo, and Vivo, which have consistently ranked among the top two or three in the mobile phone market.