"The first generation of the entrepreneurs provided us with many rare materials, including old photos, mails, manuscripts and products," says Jin.

And museums and corporate archives were also sources of material for the research team, as they contained documents such as the first registration certificate of a privately owned high-tech company.

"We also got material from the public. For example, an early Lenovo computer in the documentary is borrowed from a technology enthusiast," says Jin.

The documentary features more than 100 people, including entrepreneurs, scientists, professionals, government officials and others who witnessed the development of Zhongguancun. Ni Guangnan from the Chinese Academy of Engineering impressed Liu with his attitude.

"He is still thinking about development and industrialization, and he is also helping young people," says Liu.