Chai says, the children's destinies, along with the development of their village, is gradually changing.

More than 10 folk songs from Nujiang are used in the film as background music. "The Nujiang area is a treasure trove of folk songs, and we used such songs to render people's emotions," says Liu Hengzhi, the sound designer of the production.

According to Liu Heng, vice-president of the China Federation of Literary and Art Circles, the documentary depicts the real life of people in a corner of China in a simple style.

"On the one hand, it reflects a lofty social vision … No matter how successful you are, you need to pay attention to those who may not have so much wealth.

"On the other hand, we may have many artistic styles, but it is most important to be sincere and simple. I can see such a spirit in the filmmakers of this work," he adds.