China-US Focus presents a special series On Hong Kong, that explores the major milestones of this renowned global city at a unique point in its modern history. Through the words and insights of C.H. Tung, who led Hong Kong on its return to China in 1997 as Chief Executive, it offers a unique understanding to the challenges it faces, and the solutions that are required to address them. In Part 4, he identifies the trigger points for the protests, highlighting the income disparity and the social inequality this creates at the core of the division. Interviewed by James Chau.