What's the ending of Nan Zhou in the brief introduction of The World on Earth?

On Earth, Nan Zhou died unexpectedly in the United States.

Related story: Grandpa told him in Nan Zhou when he was a child that if he was in danger, whether he was a friend or a classmate, our Zhou family would go up and help him. Nan Zhou remembered Zhou Zhigang's words.

When Nan Zhou was in America, he was robbed by gangsters. The other party took all Nannan's money and asked Nannan's friends to hand it over. The friend refused, and the other party took out a gun and pointed it at Nannan's friend. Nannan stood up to protect his friend, but he died.

Character introduction:

Nan Zhou (played by Wu Xingjian) is not only a sensible and clever "good boy", but also a teenager with complicated life experiences. He is ambitious, idealistic and responsible.

He has always regarded "keeping his family away from the glamorous film" as his own responsibility and is not moved by the money temptation of his biological father. He was admitted to the university and went abroad for further study on his own. Later, on his way home from vacation, he was shot and killed by gangsters.