In 1998, the Chinese heritage protection team entered Angkor, Cambodia to join in international cooperation of restoring ancient monuments. Through 20-year hard working, China is now recognized as the rotating chairman of the upcoming project. This is the first time that China steps out the country to provide assistance on cultural development. What has the team been through during past 20 years? How did they overcome the challenge? And how did they balance the restoration concept of different experts? Nowadays, the destroyed Angkor has been gradually recovered, and two generations of Chinese people have contributed to the grand project. They will continue their journey, keep working on the sustainable development of Angkor and other world heritages.