Paper Airplanes (2001)

Paper Airplane is a feature-length documentary that looks at the breakdown of China’s socialist systems, which had provided jobs and security, allowing disenfranchised youths to fall into new lifestyles that sometimes involve the underworld of drugs. With his camera rolling in houses, on the streets, and on the inside of government-sponsored programs, Zhao follows a group of young addicts through their attempts at rehabilitation. —

I could not find much on Zhao Liang´s first feature.